Adoucette -
Nice job on the tanks sir. Thanks for sending the details on them. It's VERY clear that you take alot of pride in your work.
Sorry that I haven't got back to you guys in a few days. I've been really busy at work this weekend, and too tired to think on this level(some may joke that that is always the case). LOL.
Ok, well....you all made me do a little searching this time for an adequate rebutle to your most current remarks about diatoms. Congratulations, I had to think. Dang, I'm a brat!
QUOTE
As Grumpy stated, diatoms and the deep ocean would be ideal for preserving other fossils, cold, lack of light and low O2 take care of that. It wouldn't matter the depth since most marine life occurs in the top layers of the oceans, but in most cases they sink when they die. So they will get to the bottom.
Bacteria and such would eat a lot off the ocean floor, but not all, particularly the larger bones from the cetaceans and since you already established that Dinos were also roaming around at the time, then add in a few pleosaurs and the like.
The point being, its DIATOMS, DIATOMS ALL THE WAY DOWN, and these deposits are huge and quite widespread across the globe and yet not one of them has ANY evidence of more advanced life forms. This is well established since we mine these for all sorts of things besides use as a pool filter so there have been extensive digs into them and like the Cliffs of Dover, where there are miles of exposed area and as noted, serious erosion, still, nothing but diatoms. Thus there is no logical explanation except that they were the only form of life in the sea at the time that left skeletal remains.
346 fossil whales buried in thick, muddy, diatomaceous sediment
‘We knew it was a great find,’ said paleontologist Leonard Brand about the fossil whales he saw in Peru in 1999, 350 km (200 miles) south of Lima, the capital...."
Overall, they found 346 whales within a 1.5-km2 (370-acre) area, buried in an 80-m (260-ft) thick layer of sedimentary rock called diatomite. This layer is part of the Pisco Formation, which varies in thickness from 200–1,000 m (650–3,300 ft).
Diatomite is sedimentary rock containing a high percentage of fossil diatoms—small single-celled algae, which commonly live near the ocean surface. The layer of diatomite in Peru has 5 to 10% clay and abundant volcanic ash.
Today, when diatoms die, their silica skeletons accumulate on the ocean floor. One gram (0.035 oz.) of diatomite may contain up to 400 million skeletons.4 Diatomite sediment normally accumulates slowly—only a few centimetres per thousand years.1 Even where the rate is higher, such as in some shallow-water areas, accumulation is still slow. For example, in the fjords of British Columbia, diatoms and clay accumulate at 2.5–5.0 mm (0.1–0.2 inches) per year.2
Also today, when a whale carcass sinks to the bottom of the ocean, many kinds of scavengers quickly attack and colonize it. And in their quest for food, some scavengers churn up the adjacent sediments.5
However, in Peru, the fossilized whales and diatoms were well preserved and the whale skeletons were mostly intact. There was no evidence of normal decay, such as wormholes, barnacle encrustations or general degradation. Neither was there any sign that organisms had churned up the adjacent sediment.
The whale skeletons were partially mineralized, and, remarkably, baleen from five whales was preserved. Baleen forms the comb-like structure in the whale’s mouth that filters its food. This is remarkable because it is softer than bone—the same composition as our human fingernails.
There is no doubt that these well-preserved whales, entombed in diatomite, indicate rapid burial. After eliminating other possibilities, Brand and his coauthors concluded:
‘The most viable explanation for whale preservation seems to be rapid burial, fast enough to cover whales 5–13 m [16–42 ft] long and approximately 50 cm [20 in] thick within a few weeks or months, to account for whales with well-preserved bones and some soft tissues.’1
These burial times are probably a maximum, based on a comparison with modern environments. It could have been even faster than a few weeks.
Remarkably, these rapidly buried fossil whales contradict one of the ruling principles of modern geology, uniformitarianism—i.e. rocks formed slowly in the past similar to what we observe in the present. Interpreted according to that principle, the whales were buried over a period of two million years about 10 million years ago. However, the fact that 80 m of sediment buried 346 whales within months or weeks (or less) creates a problem for those who believe in millions of years. Where do they put the time? There is nowhere for it in the rocks.
From the report in Geology, we know that there were strong water currents in the region, since there are abundant, small channels that have been scoured out and refilled with sediment in the Pisco Formation. There was also time for sharks to scavenge, since the scientists found shark teeth with the skeletons. In fact, they noticed some whale bones embedded with the tips of shark teeth. The team found other vertebrates in the deposit besides sharks and whales. These included marine animals such as fish, turtles, seals and porpoises, and land animals such as ground sloths and penguins.
They suggest the whales and marine vertebrates died when a massive bloom (multiplication) of diatoms, thickened by lateral water currents, poisoned the water.6 There is no evidence that the whales beached. Ash from volcanic eruptions could have provided the nutrients for a diatom population explosion. However, the existence of land vertebrates, especially the ground sloths, seems to be a problem here. A similar post-Flood scenario was applied to a whale found in diatomite at Lompoc, California.7
The 80-90 ft (24-27 m) long fossilised baleen whale found in April 1976 in an inclined position in a diatomite unit in the Miguelito Mine at Lompoc, California, was not buried while 'standing on its tail'(I put this part of the quote so you don't think that I'm using this for evidence of polystrate fossils). An onsite investigation has revealed that the diatomite unit which entombed the whale is also inclined at the same angle, the whale having been buried in the diatomite unit while both were in the horizontal position, and subsequent earth movements having tilted both. Nevertheless, this whale fossil still bears testimony to its catastrophic burial, and thus the catastrophic deposition of the enclosing diatomite.
"The current uniformitarian (slow and gradual) model for diatomite deposition, as seen in the Guaymas Basin of the Gulf of California, is not capable of explaining the purity of the Lompoc diatomite...the deposition rate is too slow to avoid corrosion and scavenging of the bones. both of which are absent from the Lompoc whale bones."
Well, there you have it. Not only are there other fossils within the diatomaceous earth, but there are some of the biggest and most "modern" ones. I don't know why it's rare to find fossils in diamataceous deposits. That seems really strange to me. The fact is, thought, that it does indeed happen. These are just SOME examples. I'm sure I could find quite a few more if you'd like me to look, but this should be sufficient. Just thought you'd like to know.
Paradox -
QUOTE (->
| QUOTE |
As Grumpy stated, diatoms and the deep ocean would be ideal for preserving other fossils, cold, lack of light and low O2 take care of that. It wouldn't matter the depth since most marine life occurs in the top layers of the oceans, but in most cases they sink when they die. So they will get to the bottom.
Bacteria and such would eat a lot off the ocean floor, but not all, particularly the larger bones from the cetaceans and since you already established that Dinos were also roaming around at the time, then add in a few pleosaurs and the like.
The point being, its DIATOMS, DIATOMS ALL THE WAY DOWN, and these deposits are huge and quite widespread across the globe and yet not one of them has ANY evidence of more advanced life forms. This is well established since we mine these for all sorts of things besides use as a pool filter so there have been extensive digs into them and like the Cliffs of Dover, where there are miles of exposed area and as noted, serious erosion, still, nothing but diatoms. Thus there is no logical explanation except that they were the only form of life in the sea at the time that left skeletal remains.
|
346 fossil whales buried in thick, muddy, diatomaceous sediment
‘We knew it was a great find,’ said paleontologist Leonard Brand about the fossil whales he saw in Peru in 1999, 350 km (200 miles) south of Lima, the capital...."
Overall, they found 346 whales within a 1.5-km2 (370-acre) area, buried in an 80-m (260-ft) thick layer of sedimentary rock called diatomite. This layer is part of the Pisco Formation, which varies in thickness from 200–1,000 m (650–3,300 ft).
Diatomite is sedimentary rock containing a high percentage of fossil diatoms—small single-celled algae, which commonly live near the ocean surface. The layer of diatomite in Peru has 5 to 10% clay and abundant volcanic ash.
Today, when diatoms die, their silica skeletons accumulate on the ocean floor. One gram (0.035 oz.) of diatomite may contain up to 400 million skeletons.4 Diatomite sediment normally accumulates slowly—only a few centimetres per thousand years.1 Even where the rate is higher, such as in some shallow-water areas, accumulation is still slow. For example, in the fjords of British Columbia, diatoms and clay accumulate at 2.5–5.0 mm (0.1–0.2 inches) per year.2
Also today, when a whale carcass sinks to the bottom of the ocean, many kinds of scavengers quickly attack and colonize it. And in their quest for food, some scavengers churn up the adjacent sediments.5
However, in Peru, the fossilized whales and diatoms were well preserved and the whale skeletons were mostly intact. There was no evidence of normal decay, such as wormholes, barnacle encrustations or general degradation. Neither was there any sign that organisms had churned up the adjacent sediment.
The whale skeletons were partially mineralized, and, remarkably, baleen from five whales was preserved. Baleen forms the comb-like structure in the whale’s mouth that filters its food. This is remarkable because it is softer than bone—the same composition as our human fingernails.
There is no doubt that these well-preserved whales, entombed in diatomite, indicate rapid burial. After eliminating other possibilities, Brand and his coauthors concluded:
‘The most viable explanation for whale preservation seems to be rapid burial, fast enough to cover whales 5–13 m [16–42 ft] long and approximately 50 cm [20 in] thick within a few weeks or months, to account for whales with well-preserved bones and some soft tissues.’1
These burial times are probably a maximum, based on a comparison with modern environments. It could have been even faster than a few weeks.
Remarkably, these rapidly buried fossil whales contradict one of the ruling principles of modern geology, uniformitarianism—i.e. rocks formed slowly in the past similar to what we observe in the present. Interpreted according to that principle, the whales were buried over a period of two million years about 10 million years ago. However, the fact that 80 m of sediment buried 346 whales within months or weeks (or less) creates a problem for those who believe in millions of years. Where do they put the time? There is nowhere for it in the rocks.
From the report in Geology, we know that there were strong water currents in the region, since there are abundant, small channels that have been scoured out and refilled with sediment in the Pisco Formation. There was also time for sharks to scavenge, since the scientists found shark teeth with the skeletons. In fact, they noticed some whale bones embedded with the tips of shark teeth. The team found other vertebrates in the deposit besides sharks and whales. These included marine animals such as fish, turtles, seals and porpoises, and land animals such as ground sloths and penguins.
They suggest the whales and marine vertebrates died when a massive bloom (multiplication) of diatoms, thickened by lateral water currents, poisoned the water.6 There is no evidence that the whales beached. Ash from volcanic eruptions could have provided the nutrients for a diatom population explosion. However, the existence of land vertebrates, especially the ground sloths, seems to be a problem here. A similar post-Flood scenario was applied to a whale found in diatomite at Lompoc, California.7
The 80-90 ft (24-27 m) long fossilised baleen whale found in April 1976 in an inclined position in a diatomite unit in the Miguelito Mine at Lompoc, California, was not buried while 'standing on its tail'(I put this part of the quote so you don't think that I'm using this for evidence of polystrate fossils). An onsite investigation has revealed that the diatomite unit which entombed the whale is also inclined at the same angle, the whale having been buried in the diatomite unit while both were in the horizontal position, and subsequent earth movements having tilted both. Nevertheless, this whale fossil still bears testimony to its catastrophic burial, and thus the catastrophic deposition of the enclosing diatomite.
"The current uniformitarian (slow and gradual) model for diatomite deposition, as seen in the Guaymas Basin of the Gulf of California, is not capable of explaining the purity of the Lompoc diatomite...the deposition rate is too slow to avoid corrosion and scavenging of the bones. both of which are absent from the Lompoc whale bones."
Well, there you have it. Not only are there other fossils within the diatomaceous earth, but there are some of the biggest and most "modern" ones. I don't know why it's rare to find fossils in diamataceous deposits. That seems really strange to me. The fact is, thought, that it does indeed happen. These are just SOME examples. I'm sure I could find quite a few more if you'd like me to look, but this should be sufficient. Just thought you'd like to know.
Paradox -
So you believe in micro-evolution but not evolution...........?
Yes and no. I think Microevolution is sort of a misnomer. I don't like the word, because it's used to infer that from it comes impossible things. However, that being said, yes I do believe in "microevolution". It is the built in process that enables species to adapt, slightly, to their environment. It's all based on genes already inherent to the type of animal it is. A canine will NEVER become feline. A reptile with NEVER become avian. There are well established limits.
Grumpy -
Good luck on the surgery sir. I hope everything goes well. Here's looking forward to hearing from you again. I'll keep you in my prayers, if that's ok.
Peace guys,
- Seeker
adoucette
27th September 2005 - 04:40 PM
Nice try but the Pisco formation dates from at most 16 million years ago up to 5 million years ago. They are believed to have been formed fairly rapidly, compared to most diatom formations on SEA BEDS, because of currents in the BAY where they formed, thus they don't contradict anything.
The lower layers of the chalk cliffs, which are all diatoms, predate the Pisco formation by over 500 million years.
Arthur
Seeker
27th September 2005 - 07:04 PM
Adoucette -
Please don't insult me, or sell yourself short with this dating crap!! You KNOW it's super unreliable and most of it is only dated to fit the theory. Don't waste my time please sir. I've waited 2 days for a response, and you come to me with this?
Evolutionary dating schemes are almost always an exercise in circular reasoning that leads to NO real answers. Up until this point, the conversation was coming along swimmingly(at least I thought), so please lets get back on task instead of quoting fairytales. This is a scientific forum, so let's not fill it with guesswork that is totally based on poor assumptions/circular logic.
I'm sorry that this response is so strong. It's just that THAT is the type of crap that is thrown around all the time. It's just ridiculous and does the evolutionary mode of thinking NO CREDIT WHATSOEVER. Your other posts on this topic had me thinking and having to do some research, but this is just silly sir.
Ok, ok. I'm calming down.
Oh, one more thing. The fact that there are relatively few fossils of larger animals should fit into "the flood" theory that you're always trying to refute. IF, the world had been indeed covered with water the fact that the diatoms are usually under the other layers and have almost no other fossils makes perfect sense. They would have been layered as a sediment layer all to themselves.
Alright guys, I'll talk to you later.
- Seeker
P.S. Grumpy I hope you're feeling better. Please write in when you can.
adoucette
27th September 2005 - 09:10 PM
QUOTE (Seeker+Sep 27 2005, 07:04 PM)
Please don't insult me, or sell yourself short with this dating crap!! You KNOW it's super unreliable and most of it is only dated to fit the theory. Don't waste my time please sir. I've waited 2 days for a response, and you come to me with this?
Evolutionary dating schemes are almost always an exercise in circular reasoning that leads to NO real answers.
Didn't mean to "insult you", but I suspect you insulted a bunch of dedicated researchers by implying that their work yielded nothing but "a bunch of crap".
Please explain why you think U/Pb and Ar/Ar dating is a "bunch of crap".
Keep in mind that these methods don't need to rely on ANY assumptions about the initial volume of U or Ar in the samples, but simply record the ratio of the isotopes which are generated from the initial U or Ar.
While the accuracy of the dating is not absolute (+/- 200,000 years), when dating things back to many millions of years before present it is more than sufficient for its intended use.
Arthur
Seeker
28th September 2005 - 03:22 AM
Adoucette -
Hey dude. Ok, in answer to your questions. I may well have insulted MANY "scientists" with my ealier comments. The thing is, I think that attention needs to be brought to the bunch of crackpot psuedo-scientific method that they use to determine things. They predetermine what they need to find and then go after it under the pretence of objective science.
Firstly let's go with Ar/Ar method. This DOES INDEED come with great assumptions of it's own. The scientific community at large seems to be ok with that, and therein lies(LIES) the problem. For example:
According to the assumptions foundational to potassium-argon (K-Ar) and argon-argon (Ar-Ar) dating of rocks, there should not be any daughter radiogenic argon (40Ar*) in rocks when they form. When measured, all 40Ar* in a rock is assumed to have been produced by in situ radioactive decay of 40K within the rock since it formed. However, it is well established that volcanic rocks (e.g. basalt) contain excess 40Ar*, that is, 40Ar which cannot be attributed to either atmospheric contamination or in situ radioactive decay of 40K. This excess 40Ar* represents primordial Ar carried from source areas in the earth's mantle by the parent magmas, is inherited by the resultant volcanic rocks, and thus has no age significance.
However, are all other rocks in the earth's crust also susceptible to "contamination" by excess 40Ar* emanating from the mantle? If so, then the K-Ar and Ar-Ar "dating" of crustal rocks would be similarly questionable.
When muscovite (a common mineral in crustal rocks) is heated to 740°-860°C under high Ar pressures for periods of 3 to 10.5 hours it absorbs significant quantities of Ar, producing K-Ar "ages" of up to 5 billion years, and the absorbed Ar is indistinguishable from radiogenic argon (40Ar*). In other experiments muscovite was synthesized from a colloidal gel under similar temperatures and Ar pressures, the resultant muscovite retaining up to 0.5 wt% Ar at 640°C and a vapor pressure of 4,000 atmospheres. This is approximately 2,500 times as much Ar as is found in natural muscovite. Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize.
Because it is known that excess 40Ar* is carried from the mantle by plumes of mafic magmas up into the earth's crust, it is equally likely that much of the excess 40Ar* in crustal rocks could be primordial 40Ar. Thus, we have no way of knowing if any of the 40Ar* measured in crustal rocks has any age significance. Additional to the primordial 40Ar from the mantle is 40Ar* released from minerals and rocks during diagenesis and metamorphism, so that there is continual migration and circulation of both primordial 40Ar and 40Ar* in the crust which is reflected in their presence in CO2-rich natural gases. Therefore, when samples of crustal rocks are analyzed for K-Ar andAr-Ar "dating," one can never be sure that whatever 40Ar* is in the rocks is from in situ radioactive decay of 40K since their formation, or if some or all of it came from the mantle or from other crustal rocks and minerals. Thus all K-Ar and Ar-Ar "dates" of crustal rocks are questionable, as well as fossil "dates" calibrated by them.19
In summary, many scientists assume that since argon is a gas, all of it should have escaped from the lava before it cooled. Therefore, all the 40Ar in the rock should be the result of decay from potassium. Based on the measured potassium, argon, and the decay rate, they calculate an age. That is why it does not matter how long the magma was in the volcano before it erupted. They believe that when the volcano erupts, all the 40Ar escapes, and the atomic clock gets reset to zero.
If all the argon escaped from hot lava of volcanoes that erupted long ago, then all the argon should escape from the hot lava of volcanoes that erupt in modern times too. But modern lava does have 40Ar in it. This is known as the "excess argon problem". Scientists are well aware of this problem and use various calibration methods to "correct" for this problem. However, how are these calibration methods established? Upon what basis are they validated?
Circular Calibration Methods
There is a methodological problem connected with the manner in which geologists infer the argon-retention abilities of different minerals. Concerning the suitability of different minerals for K-Ar dating, Faure (1986, p. 72) writes "The minerals beryl, cordierite, pyroxene, and tourmaline frequently contain excess 40Ar, while hornblende, feldspar, phlogopite, biotite, and sodalite contain such excess 40Ar only rarely ... ." And how is this known? By comparing the K-Ar dates yielded by such minerals with the expected ones. Thus the correctness of the geologic time scale is assumed in deciding which minerals are suitable for dating. For example, concerning the use of glauconies for K-Ar dating, Faure (1986, p. 78) writes, "The results have been confusing because only the most highly evolved glauconies have yielded dates that are compatible with the biostrategraphic ages of their host rocks whereas many others have yielded lower dates. Therefore, K-Ar dates of 'glauconite' have often been regarded as minimum dates that underestimate the depositional age of their host." All of the choices are made in order to obtain dates that are more in agreement with each other.
It is also interesting that Faure (1986, pp. 345-6) mentions that fission track dating is calibrated (the "zeta calibration") using rocks of "known" ages. However, if these "known" ages are incorrect, then fission track dating that is based on these ages is also incorrect. Thus fission track dating is not an independent test that helps to verify the accuracy of other tests. The result is that radiometric dating in general is in danger of being based on circular reasoning.25
Examples of Problems with Radiometric Dating Techniques
Dalrymple's work early work on 26 historic lava flows showed that many of them had excess argon and were not set to zero at the eruption of the volcano. The following is the data from these tests: 5
Hualalai basalt, Hawaii (AD 1800-1801) 1.05 to 1.19 million years
Mt. Etna basalt, Sicily (122 BC) 100,000 years
Mt. Etna basalt, Sicily (AD 1972) 150,000 years
Mt. Lassen plagioclase, California (AD 1915) 130,000 years
Sunset Crater basalt, Arizona (AD 1064-1065) 210,000 to 220,000 years
Glass Mountain (BP 130-390) 130,000 years in the future
Mt. Mihara (AD 1951) 70,000 years in the future
Sakurajima (AD 1946) 200,000 years in the futureThat takes care of that. Very very suspect at best.
Here's some info on the prolems with Isochron dating:
Isochrons
The word "isochron" basically means "same age". Isochron dating is based on the ability to draw a straight line between data points that are thought to have formed at the same time. The slope of this line is used to calculate an age of the sample in isochron radiometric dating. The isochron method of dating is perhaps the most logically sound of all the dating methods. This method seems to have internal measures to weed out those specimens that are not adequate for radiometric evaluation. Also, the isochron dating systems seem to eliminate the problem of not knowing how much daughter element was present when the rock formed.
Isochron dating is unique in that it goes beyond measurements of parent and daughter isotopes to calculate the age of the sample based on this simple ratio and the decay rate. Another measurement is taken when calculating isochron ages. What is needed is a measurement of a second isotope of the same element as the daughter. Also, several different measurements are needed from various locations and materials within the specimen. This is different from the normal single point test used with the other "generic" methods. To make the straight line needed for isochron dating, each group of measurements (parent - P, daughter - D, daughter isotope - Di) is plotted as a data point on a graph. The X-axis on the graph is the ratio of P to Di. For example, consider the following isochron graph: 21
Obviously, if a line were drawn between these data points on the graph, there would be a very nice straight line with a positive slope. Such a straight line would seem to indicate a strong correlation between the amount of P in each sample and the extent to which the sample is enriched in D relative to Di. Obviously one would expect an increase in the ratio of D as comparied with Di over time because P is constantly decaying into D, but not into Di. So, Di stays the same while D increases over time.
But, what if the original rock was homogenous when it was made? What if all the minerals were evenly distributed throughout, atom for atom? What would an isochron of this rock look like at this point? It would look like a single dot on the graph. Why? Because, any testing of any portion of the object would give the same results.
The funny thing is, as rocks cool, different minerals within the rock attract certain atoms more than others. Because of this, certain mineral crystals within a rock will incorporate different elements into their structure based on their chemical differences. However, since isotopes of the same element have the same chemical properties, there will be no preference in the inclusion of any one isotope over any other in any particular crystalline mineral as it forms. Thus, each crystal will have the same D/Di ratio as the source material had. So, when put on an isochron graph, each mineral will have the same Y-value. However, the P element is different from the D/Di element. Thus, different minerals will select different ratios of P as compared with D/Di. Such variations in P to D/Di ratios in different elements would be plotted on an isochron graph as a straight, flat line (no slope).
Since a perfectly horizontal line is likely obtained from a rock as soon as it solidifies, such a horizontal line is consistent with a "zero age." In this way, even if the daughter element is present initially when the rock is formed, its presence does not necessarily invalidate the clock. Time might still be able to be determined based on changes in the slope of this horizontal line.
As time passes, P decays into D in each sample. That means that P decreases while D increases. This results in a movement of the data points. Each data point moves to the left (decrease in P) and upwards (increase in D). Since radioactive decay proceeds in a proportional manner, the data points with the most P will move the most in a given amount of time. Thus, the data points maintain their linear arrangement over time as the slope between them increases. The degree of slope can then be used to calculate the time since the line was horizontal or "newly formed". The slope created by these points is the age and the intercept is the initial daughter ratio. The scheme is mathematically sound.
The nice thing about isochrons is that they would seem to be able to detect any sort of contamination of the specimen over time. If any data point became contaminated by outside material, it would no longer find itself in such a nice linear pattern. Thus, isochrons seem to contain somewhat of an internal indicator or control for contamination that indicates the general suitability or unsuitability of a specimen for dating.
So, it is starting to look like isochron dating has solved some of the major problems of other dating methods. However, isochron dating is still based on certain assumptions.
All areas of a given specimen formed at the same time
The specimen was entirely homogenous when it formed (not layered or incompletely mixed)
Limited Contamination (Contamination can form straight lines that are misleading)
Isochrons that are based on intraspecimen crystals can be extrapolated to date the whole specimen
Given these assumptions and the above discussion on isochron dating, some interesting problems arise as one considers certain published isochron dates. As it turns out, up to "90%" of all published dates based on isochrons are "whole-rock" isochrons.22
So, what exactly is a whole-rock isochron? Whole-rock isochrons are isochrons that are based, not on intra-rock crystals, but on variations in the non-crystalline portions of a given rock. In other words, sample variations in P are found in different parts of the same rock without being involved with crystalline matrix uptake. This is a problem because the basis of isochron dating is founded on the assumption of original homogeny. If the rock, when it formed, was originally homogenous, then the P element would be equally distributed throughout. Over time, this homogeny would not change. Thus, any such whole-rock variations in P at some later time would mean that the original rock was never homogenous when it formed. Because of this problem, whole-rock isochrons are invalid, representing the original incomplete mixing of two or more sources.
Interestingly enough, whole rock isochrons can be used as a test to see if the sample shows evidence of mixing. If there is a variation in the P values of a whole rock isochron, then any isochron obtained via crystal based studies will be automatically invalid. The P values of various whole-rock samples must all be the same, falling on a single point on the graph. If such whole-rock samples are identical as far as their P values, mixing would still not be ruled out completely, but at least all available tests to detect mixing would have been satisfied. And yet, such whole-rock isochrons are commonly published. For example, many isochrons used to date meteorites are most probably the result of mixing since they are based on whole-rock analysis, not on crystalline analysis.22
There are also methods used to detect the presence of mixing with crystalline isochron analysis. If a certain correlation is present, the isochron may be caused by a mixing. However, even if the correlation is present, it does not mean the isochron is caused by a mixing, and even if the correlation is absent, the isochron could still be caused by a more complex mixing (Woodmorappe, 1999, pp. 69-71). Therefore such tests are of questionable value.And, finally, let's get to the U/Pb you asked about:
Zircons and Uranium-Lead Dating
Uranium-238 has a half-life decay of 4.5 billion years. It gives rise to Thorium-234
Thorium-234 has a half-life decay of 24 days. It's daughter product is protactinium-234.
Protactinium-234 decays in about one minute. It gives rise to uranium-234.
Uranium-234 has a half-life of 233,000 years. It yields Thorium-230.
Thorium-230 takes about 83,000 years to decay. It's daughter product is radium-226.
Radium-226 decays in 1600 years. It is converted to radon-222.
Radon-222 takes 3.8 days to decay into polonium-218.
Polonium-218 has the short life of 3 minutes before it is decayed into the next product on our list, lead-214.
Lead-214 takes 24 minutes to decay into bismuth-214.
Bismuth-214 lives only 20 minutes before becoming polonium-214.
Polonium-214 has the short life of 150 microseconds before converting itself to lead-210.
Lead-210 yields bismuth-210 in about 22 years.
Bismuth-210 then gives rise to polonium-210 in about 5 days.
Polonium-210 finally decays into lead-206 which is stable.
"Simple laboratory (Hf) leaching experiments of zircon provide a clear link between enhanced solubility of U234 and radiogenic lead due to alpha-recoil damage (Davis and Krogh submitted; Mattinson 1994). Furthermore, because most upper crustal rocks cooled below annealing temperatures long after their formation, early formed lead rich in Pb207 is locked in annealed sites so that the leachable component is enriched in recently formed Pb206. The isotopic composition of the leachable lead component then depends more on the cooling history and annealing temperatures of each host mineral than on their geological age; and the axiom that Pb isotopes cannot be fractionated in the natural environment, is invalid. . . Although these experiments are based on a strong Hf attack on zircons, we believe, given the widespread U234 anomalies (of several hundred percent) observed in groundwater (Osmond and Cowart 1992), that they apply to the differential mobility of radiogenic Pb isotopes on a local and global scale."33
Also, consider the following excerpt concerning ancient zirons from the Gabbro-Peridotite Complex of the Mar:
"All the grains are characterized by high common Pb content: 206Pb/204Pb ratios are in the interval 18.36-18.66 [usually around 5000]. There was constructed Pb-Pb isochron on the four points of studied zircon with the age corresponding to 3476+/-510 Ma (MSWD=0.4). High error of the age estimation is caused by rather limited variation of 206Pb/204Pb ratio in the studied zircons and a comparatively high error in determination of Pb isotope composition. Zircon age calculations on the base of Upb systematics have been complicated by high share of common Pb and uncertainty of its isotope composition. . . . Common lead was captured in the process of zircon crystallization, perhaps, by mineral and fluid inclusions. But there is a small share of inherited zircon substance with the age of 3.0-3.5 Ga in the composition of the studied zircon. Thus, the discordia itself obtained by us is interpreted as a result of mixture of newly formed young zircon with some share of Archean zircon presented in each studied crystal."34
Consider as well that the "206Pb/204Pb ratio, used for contamination control and common lead correction, is limited to a precision of 3-10% RSD."35
Also, if errors for individual zircon tests are too large, these values are simply discarded. Those "analyses with large errors that can be attributed to the presence of zoning, cracks and inclusions in the analyzed zircon" Such data are simply "rejected from the dataset." In addition, "High uranium content may cause a zircon to become metamict due to destruction of the crystal lattice by radiation. This enhances the mobility of U and especially Pb." So, high uranium content is "also a reason for rejection of some analyses." A "correction is also applied for common Pb on the basis of the abundance of 204Pb, which was typically 10 ppm in all standards measured and variable in the samples."36
So, how confident can one be in zircon dates who's published 204Pb levels range from very high to very low? It seems to me that quite often published U-Pb and Pb-Pb dates do in fact involve fairly significant 204Pb levels.33,37,38 Certainly there are "correction" factors to and methods of selection are used compensate for this common lead, but how are these calibrated and how is the reliability of the calibration and selection method determined? Of course, if the level of 204Pb is too high, the data obtained is not calibrated, but is simply discarded.39 And, what about the fact that other isotopes of uranium, thorium, as well as the many lead isotopes move around, in and out of zircon crystals, as a function of temperature, radiation, and other sorts of factors over time? Doesn't this mess up the idea that all lead in zircons must be the result of radioactive decay? I hope that is satisfactory for you sir. It's great that you all make my do my research. I really thank you guys for that.
- Seeker
Seeker
28th September 2005 - 03:52 AM
Adoucette -
Also, have you heard anything from Grumpy lately? Is he doing well after the operation? Let him know I say hi, if you're in communication with him.
Thanks,
- Seeker
adoucette
28th September 2005 - 04:08 AM
Grumpy has got through his surgery and is enjoying the joys of pain management, maybe a bit too well from his few posts that he has made from his hospital bed.
Well I found your exact reply to the U/Pb question in a UseNet Archive, and since it was just a snippet of a thought its fairly meaningless unless you can provide the source material.
http://www2.usenetarchive.org/Dir30/File603.htmlArthur
Seeker
28th September 2005 - 04:20 AM
The Ar/Ar material is sufficient for you though? I take it that it was, from the lack of it's mention and the verbage/tone of your response.
- Seeker
P.S. hold on. i'll get the source material. just gimme a minute. i didn't pull it off
of a usenet post. i'll post again shortly. This is fun.
P.P.S. thanks for the info on Grumpy. i guess he's been posting on different
forums?
Seeker
28th September 2005 - 04:38 AM
adoucette
28th September 2005 - 04:55 AM
QUOTE (Seeker+Sep 28 2005, 03:22 AM)
Examples of Problems with Radiometric Dating Techniques
Dalrymple's work early work on 26 historic lava flows showed that many of them had excess argon and were not set to zero at the eruption of the volcano. The following is the data from these tests: 5
Hualalai basalt, Hawaii (AD 1800-1801) 1.05 to 1.19 million years
Mt. Etna basalt, Sicily (122 BC) 100,000 years
Mt. Etna basalt, Sicily (AD 1972) 150,000 years
Mt. Lassen plagioclase, California (AD 1915) 130,000 years
Sunset Crater basalt, Arizona (AD 1064-1065) 210,000 to 220,000 years
Glass Mountain (BP 130-390) 130,000 years in the future
Mt. Mihara (AD 1951) 70,000 years in the future
Sakurajima (AD 1946) 200,000 years in the future
That takes care of that. Very very suspect at best.
If you are just going to post any old BS you find on the ICR website than this is a waste of time and certainly not indicative of you doing any "research".
Your excerpt comes from ICR Impact No. 307 by Andrew A. Snelling
http://www.icr.org/pubs/imp/imp-307.htmSheesh.
Brent Dalrymple is a well-known geochronologist. He did much of the landmark work establishing the guidelines and baselines for more accurate potassium/argon dating, and part of this work entailed measuring Ar-40 levels in relatively young lava flows to make certain that Ar-40 actually did evaporate from the hot lava. One additional thing he verified was that intrusions can not be reliably dated using K/Ar dating because the Ar-40 had no opportunity to escape into the atmosphere and so is still trapped in the rock.
If you look at reference #3 for where Snelling says he got the dates that he attributed to Dalrymple you'll see that the reference is not to Dalrymple but from Snelling himself. Snelling's text attributes the dates to Dalrymple, but in reality they come from a different Snelling paper. Follow the link in reference #3 to this Snelling paper titled The Cause of Anomalous Potassium-Argon "Ages" for Recent Andesite Flows at Mt Ngauruhoe, New Zealand, and the Implications for Potassium-Argon "Dating" and you'll see the 7 dates of young basalts that actually come from Dalrymple are less than 2 million years old.
Since K/Ar dating is only used for material older than 50 million years, a possible residual amount of Ar-40 at levels measured by Dalrymple could cause
no more than a 2 million year descrepancy, and Dalrymple's work help establish guidelines for correcting even that error.
Arthur
Seeker
28th September 2005 - 07:15 AM
Adoucette -
Of course the Ar escapes in the volcanic rock, it's decent for dating that type of rock. However, imagining that it is good over all, I find funny.
- Seeker
adoucette
28th September 2005 - 11:18 AM
Seeker,
And Paleogeologists KNOW when they can use Ar and when they can't.
The fact is the MANY methods for determining the age of things have significant overlaps in their effective range.
What is CRUCIAL is when multiple tests are done (often 3 or more) the general AGREEMENT of the dates they produce, this PROVES that the techniques work because if they generated the kind of spurious results as from your post they would almost NEVER agree.
Arthur
J. Wensveen
28th September 2005 - 12:43 PM
Remember that Creationists will never accept Radioactive decay. Half-life values do not exist to them. This because the moment they accept that atoms decay over time, thus have half-life values, they must also accept the fact that there are half-life values in the thousand of years, and even longer. And this would mean accepting that the earth is older then they claim.
adoucette
28th September 2005 - 08:10 PM
QUOTE
Consider as well that the "206Pb/204Pb ratio, used for contamination control and common lead correction, is limited to a precision of 3-10% RSD."35
This comes from this:
http://www.sgab.com/hem2001/de/research/ab...ct_exjobb_1.aspgoes on to say:
206Pb/207Pb ratio measurements with ICP-SFMS show excellent precision,
down to 0.065 % total RSD. These data, and 206Pb/204Pb ratios as high as 7400 with a
precision of 1.25 % RSD results in 206Pb/207Pb dates with very good precision, well comparable to TIMS results. So, as opposed to indicating that Pb dating is inaccurate, the link shows just how accurate it is.
Arthur
birdan
30th September 2005 - 03:12 PM
Kudos to adoucette and Seeker for actually citing sources! Imagine that, in a science forum! I hope other posters note how this maximizes discourse and minimizes flaming.
Grumpy
1st October 2005 - 12:44 AM
To seeker
I have been posting about once a day in various threads. Thanks for your concern, I am now at my sisters house trying(unsuccessfully) to find a comfortable position. Sigh, no more Demerol for me. I am checking the posts a couple times a day but I really can't sit at the computer a long time yet. I am semi-ambulatory but spend most of my time in the horizontal plane. A few more days and I think I will be in much better shape, and in a much better mood. My back feels much less sensitive to what I do and that's a good sign. I'll check back in in the coming days as I become better able to sit in a chair.
Grumpy
Seeker
6th October 2005 - 06:13 AM
Wensveen -
Hey sir....glad you rejoined the discussion. Sorry that i've been out for a few days, but i've been dealing with some health issues of my own.
QUOTE
Remember that Creationists will never accept Radioactive decay. Half-life values do not exist to them. This because the moment they accept that atoms decay over time, thus have half-life values, they must also accept the fact that there are half-life values in the thousand of years, and even longer. And this would mean accepting that the earth is older then they claim.
Of course halflife values mean something to people who believe in ID. They can be measured. It's just that they don't see how you draw the conclusions that you do.
Saying that Halflife dates are accurate is a funny statement dude. That's like saying something like this.
"I can hold enough air in my lungs in one breath to last me for 20 minutes under ideal coniditions, say, lying flat with nothing else going on. You come upon me and I only have half of the oxygen capacity I'm capable of at the moment, so I must have held my breath for 10 minutes. "
Hang on.....how do you know I took a full breath? And, even if I did, how do you know I just lay down there and did nothing. Any activity could/WOULD cause a quicker dispersion of the oxygen into my system and of course the biproducts would be in a greater amount.
It's just ludicrous.
Adoucette -
Here's some more problems with the Ar/Ar method. In order to use it, you have to use another flawed method...the K/Ar method in order to come up with an "accurate" initial reading.
"D. Some problems with the 40Ar/39Ar technique.
Standard Intercalibration - In order for an age to be calculated by the 40Ar/39Ar technique, the J parameter must be known. For the J to be determined, a standard of known age must be irradiated with the samples of unknown age. Because this (primary) standard ultimately cannot be determined by 40Ar/39Ar, it must be first determined by another isotopic dating method. The method most commonly used to date the primary standard is the conventional K/Ar technique. The primary standard must be a mineral that is homogeneous, abundant and easily dated by the K/Ar and 40Ar/39Ar methods. Traditionally, this primary standard has been a hornblende from the McClure Mountains, Colorado (a.k.a. MMhb-1). Once an accurate and precise age is determined for the primary standard, other minerals can be dated relative to it by the 40Ar/39Ar method. These secondary minerals are often more convenient to date by the 40Ar/39Ar technique (e.g. sanidine). However, while it is often easy to determine the age of the primary standard by the K/Ar method, it is difficult for different dating laboratories to agree on the final age. Likewise, because of heterogeneity problems with the MMhb-1 sample, the K/Ar ages are not always reproducible. This imprecision (and inaccuracy) is transferred to the secondary minerals used daily by the 40Ar/39Ar technique. Fortunately, other techniques are available to re-evaluate and test the absolute ages of the standards used by the 40Ar/39Ar technique. Some of these include other isotopic dating techniques (e.g. U/Pb) and the astronomical polarity time scale (APTS).
Decay Constants - Another issue affecting the ultimate precision and accuracy of the 40Ar/39Ar technique is the uncertainty in the decay constants for 40K. This uncertainty results from 1) the branched decay scheme of 40K and 2) the long half-life of 40K (1.25 billion years). As technology advances, it is likely that the decay constants used in the 40Ar/39Ar age equation will become continually more refined allowing much more accurate and precise ages to be determined.
J Factor - Because the J value is extrapolated from a standard to an unknown, the accuracy and precision on that J value is critical. J value uncertainty can be minimized by constraining the geometry of the standard relative to the unknown, both vertically and horizontally. The NMGRL does this by irradiating samples in machined aluminum disks where standards and unknowns alternate every other position. J error can also be reduced by analyzing more flux monitor aliquots per standard location.
39Ar Recoil - The affects of irradiation on potassium-bearing rocks/minerals can sometimes result in anomalously old apparent ages. This is caused by the net loss of 39ArK from the sample by recoil (the kinetic energy imparted on a 39ArK atom by the emission of a proton during the (n,p) reaction). Recoil is likely in every potassium-bearing sample, but only becomes a significant problem with very fine grained minerals (e.g. clays) and glass. For multi-phase samples such as basaltic wholerocks, 39ArK redistribution may be more of a problem than net 39ArK loss. In this case, 39Ar may recoil out of a low-temperature, high-potassium mineral (e.g. K-feldspar) into a high-temperature, low potassium mineral (e.g. pyroxene). Such a phenomenon would great affect the shape of the age spectrum. "I'll find more soon i'm sure as well.
Peace guys,
- Seeker
Seeker
6th October 2005 - 06:19 AM
Adoucette -
Also, as an isochron dating method, the Ar/Ar method is subject(necessarily) to all the inherent shortcomings of this type of dating method. I described those in an earlier post.
- Seeker
Grumpy
6th October 2005 - 06:20 PM
To Seeker
Yes, each dating method has it's limitations and innaccuracies. What you failed to say is the limitations are understood and can be worked around by using multiple methods, throwing out anomolies, and averaging the rest. Also, the more limitations you encounter the wider your margin of error becomes.
The margin of error of different dating methods varies, but most(if not all) errors are in the range of a few percentage points, not the orders of magnitude necessary for your young Earth hypothesis to be possible. Even errors of 25% would leave the age of the Earth at between 3.5 and 5.5 billion years. And most errors in dating are an order of magnitude below that(2.5%). Cosmic methods of the age of the universe are being refined daily, the margin of error decreases almost daily. Right now it is set at 13.5 billion years +or-a billion or so.
So I do not get your point about errors in dating. They are known and understood by the scientists doing the work and do not support your point of view.
Grumpy
adoucette
6th October 2005 - 06:57 PM
Seeker quotes from scientific papers on how to further decrease the error of measurements and tries to use that as "proof" that they are "inaccurate".
Yes they have a degree of inaccuracy, but as Grumpy points out, it is minor in comparison to the range they are being used for.
Arthur
unregistered
30th October 2005 - 02:00 PM
Perhaps I agree that ID should not be taught in schools, perhaps I don't. I am not even sure. But should an alternate that is almost to the point of being proved false - an alternate that is only around because scientists follow it religiously - be taught? Darwinian evolution is almost as bad as Lamarckian evolution. There is no mechanism for it. Sure, natural selection is a mechanism for it. But what is the mechanism for natural selection? Random mutation? Random mutation is simply a way of saying "we don't know." There are almost no (perhaps none at all, but I don't want to say that) beneficial mutations recorded by man. The complexity of DNA forbids it. This is only one facet of the argument against evolution. Please, put up any evidence for evolution you may have.
Grumpy
30th October 2005 - 07:03 PM
unregistered
QUOTE
But should an alternate that is almost to the point of being proved false - an alternate that is only around because scientists follow it religiously - be taught? Darwinian evolution is almost as bad as Lamarckian evolution.
This statement could not be more wrong. Evolution is supported by so much evidence that the fact that it has occured throughout the history of life on Earth cannot be denied by those who have studied that evidence. The only people who can deny that conclusion are those who are ignorant of the evidence or those who, for various reasons, choose to ignore the evidence. Scientist follow where the evidence leads.
QUOTE (->
| QUOTE |
| But should an alternate that is almost to the point of being proved false - an alternate that is only around because scientists follow it religiously - be taught? Darwinian evolution is almost as bad as Lamarckian evolution. |
This statement could not be more wrong. Evolution is supported by so much evidence that the fact that it has occured throughout the history of life on Earth cannot be denied by those who have studied that evidence. The only people who can deny that conclusion are those who are ignorant of the evidence or those who, for various reasons, choose to ignore the evidence. Scientist follow where the evidence leads.
There is no mechanism for it. Sure, natural selection is a mechanism for it. But what is the mechanism for natural selection? Random mutation? Random mutation is simply a way of saying "we don't know." There are almost no (perhaps none at all, but I don't want to say that) beneficial mutations recorded by man. The complexity of DNA forbids it.
There is no mechanism,but natural selection is a mechanism??? Random mutation is only one of several mechanisms in NS. Microbes developing resistance to medication is a random mutation seen
every day in labs and hospitals and that's just one of the more obvious ones. We do know and understand a lot about these processes, so "we don't know" does not apply in this case. Irreduceable Complexity is a creationist myth, DNA can be a complicated molecule but it is made up of very simple "steps" which accumulate to more complex forms over time.
Grumpy
Paradox
28th December 2006 - 07:30 AM
QUOTE (Seeker+Sep 25 2005, 07:14 PM)
Yes and no. I think Microevolution is sort of a misnomer. I don't like the word, because it's used to infer that from it comes impossible things. However, that being said, yes I do believe in "microevolution". It is the built in process that enables species to adapt, slightly, to their environment. It's all based on genes already inherent to the type of animal it is. A canine will NEVER become feline. A reptile with NEVER become avian. There are well established limits.
Sorry it took so long to reply, I've been out for a while....
I must say that I have to disagree. The earth is a very diverse landscape, with a multitude of lifeforms.
I think that it is hard for us as humans to grasp the time span involved for a species to evolve into a (Ahem..) "new" species.
Micro evolutionists seem to agree that small changes can occur, and yet seem unwilling to believe that over time these small adaptations can accumulate in enough quantities to qualify as a new species.
Remember that to qualify as a new species the first group would not be able to breed with the second group, and the second group would be able to reproduce in kind.
Although it is highly unlikely that a cat could evolve into a dog, long ago they both had a common ancestor. These changes are fairly evident in the fossil record.
Who would have thought that something similar to a dog could evolve into a whale:
http://en.wikipedia.org/wiki/Evolution_of_cetaceansor (here we go again) that a dinosaur could evolve into a bird...
http://en.wikipedia.org/wiki/Dinosaur-bird_connectionHave you given thought to the convergent evolution? How would micro evolution explain that?
These are unrelated species that occupy the same ecological niche, and have similar appearances and functions.
http://cas.bellarmine.edu/tietjen/Evolutio...on_examples.htmI am also interested in what the "well established limits" of evolution are, because as far as I can see, given enough time, there are none.
Paradox
28th December 2006 - 07:42 AM
QUOTE (Seeker+Sep 19 2005, 04:04 AM)
Paradox -
Plenty of research has been done on the size of the ark described in the bible and it's been shown that all the major, landbased phyla(yes, including birds. They have to land sometime, right?) plus food could've fit on board, no problem. Even the largest dinos came from very small eggs....comparitively. Some have been speculated to have been born live, I believe, but certainly they also would've been small.
Also, please keep in mind that not all of the species around today necessarily were around back then. Microevolution(the only kind for which there is any evidence AT ALL), as seen in canines(dogs, wolves, coyotes and such) mostly through selective breeding can create new species, but NEVER jump phyla. A canine will always be a canine. Breeding just brings certain traits out to be more dominant through selective mating. You'll never create another type of animal from a canine. It just can't happen. Mutations and fluctuations in genetic code only ever lose genetic material or at best duplicate genes already existent in the organism.
- Seeker
ER.... Currently, scientists have named and successfully classified over 1.5 million species. It is estimated that there are as little as 2 million to as many as 50 million more species that have not yet been found. that's not including dinosaurs....
http://en.wikipedia.org/wiki/Species#Numbers_of_species Thats a heck of a lot of "animals" to fit on an ark. even if they were all just eggs. unless you think that Noah had DNA samples of them all and somehow regenerated them after the flood....
no1nose
28th December 2006 - 03:12 PM
You guys have gotten off the topic here. Just as shapes such as circles and squares do not exist in nature but only in our minds so is the logic of evolution. It is sequential and follows a straight line therefore it is not the logic of nature but of our minds. The logic of nature is non linear and quantum rather than sequential.
Al Khwarizmi - step-by-step
28th December 2006 - 04:55 PM
QUOTE
Just as shapes such as circles and squares do not exist in nature but only in our minds...


quod erat, et cetera
no1nose
29th December 2006 - 06:34 AM
You seem to have missed the point - nice pictures anyway.
swimmer
30th December 2006 - 02:46 AM
QUOTE (unregistered+Oct 30 2005, 02:00 PM)
Perhaps I agree that ID should not be taught in schools, perhaps I don't. I am not even sure.
But should an alternate that is almost to the point of being proved false - an alternate that is only around because scientists follow it religiously - be taught? Darwinian evolution is almost as bad as Lamarckian evolution. There is no mechanism for it. Sure, natural selection is a mechanism for it. But what is the mechanism for natural selection? Random mutation? Random mutation is simply a way of saying "we don't know." There are almost no (perhaps none at all, but I don't want to say that) beneficial mutations recorded by man. The complexity of DNA forbids it. This is only one facet of the argument against evolution. Please, put up any evidence for evolution you may have.
You have some strange ideas about scientists and their "belief" in evolution.
Their "belief" is not an act of faith - it comes from their philosophy - they are willing to ask questions about the world, look for evidence, follow that evidence and discover answers.
Their approach started in Europe and America - during the 17th and 18th centuries. Known as "The Enlightenment", it turned it's back on the notion that all there was to know about the world could be gleaned from revealed texts - be they religious or ancient greek. They formulated a way to ask questions of the world and to learn new information about it - i.e. what we now call science.
Up until roughly 150 years ago, for Christians including "scientists", the Biblical creation story was assumed to be true - the earth and the stars above were young (6000+ years old) and all the living creatures were created. Much of scientific progress and discovery up to this period was carried out by essentially religious and enthusiastic amateurs. There was no such thing as the professional scientist we see today. These amateurs held down regular jobs, but their profound curiosity about the world, led them to achieve a phenomenal understanding of the world.
They interpreted and published their findings about the natural world as a greater glorification of God and God's creation. But it was the results of this very curiosity that led them to realise that the earth was much older than they had assumed from the bible.
The likes of Louis Agassiz was deeply religious. But his work on glaciation in the alps in europe predicted that there had been ice ages in the past which had occurred much longer ago than the presumed 6000+ years. Charles Lyell systematised much of this type of work - which became geology as we know it today. The inescapable conclusion was that the earth was much older than had been realised. How else could layers of rock that could only have been formed at the bottom of the sea end up on top of the highest mountains?
The distribution of fossil types in these old rocks - along with his studies of the morphology of living and recently extinct creatures - led Charles Darwin to propose that creatures had lived much longer ago than 6000+ years and that species gave rise to other species over time - by natural selection or evolution - and he made that proposal at a time when they had no idea how living creatures even propagated themselves.
For Darwin's theory of evolution to be true it had to pass a crucial test - the information for "how to make" a creature had to be passed on to it's offspring
without being diluted. The information couldn't be diluted because if it were - then how could natural selection work? This was a major concern to Darwin.
Genetics was completely unknown at his time. Gregor Mendel - a monk, definitely not an atheist

- showed that genetic information was indeed passed on without being diluted.
Since then genes have been discovered, DNA turned out to be the genetic material carrying the information and the code for the "words" written in DNA's four letter alphabet has been cracked. And so has the way proteins are made from that information. So the mechanism by which evolution could occur have been tested and found to be true. This is important because if it had failed - then evolution as described by Darwin would have been impossible.
That is how science progresses - a never ending cycle of formulating questions, accruing evidence, finding answers from which you formulate further questions etc etc.
The key to it all is the philosophical change that allowed us to ask questions - by looking at the natural world - rather than reading what was written in a sacred text. Please understand it wasn't some machiavellian plot to undermine faith or religion - simply a willingness to ask questions of the world.
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