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Why the undieing belief that this was caused by an impact crater? Obviously he cannot reason the possibility of any other action influencing extinction and the iridium layer
M. Tulloch
The meteor strike CAUSED the Deccan Flood Basalts. Just look at a globe of the period. The Deccan Flood is exactly opposite the strike.
Like Hale Bopp hitting Jupiter, there could have been a number of impacts hitting the Earth. There were a number of after effects like:

which warmed up an already warm Earth, and dinosaurs being cold blooded cannot sweat excess heat away.
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