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I had to research for what is Chicxulub - it's a huge 180km impact crater caused by an estimated 10km diameter meteor along the Mexican coastline. Very interesting reading with great physical evidence.
So scientists do think this collision coincided with the dinosaur mass extinction event. But wouldn't that be more likely due to the more immediate effect of the meteor impact, especially material thrown into the atmosphere, blocking sunlight and changing the climate. This would also affect the foodchain.
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