When Exactly Did the Dinosaurs Go Extinct?

Just when did those weird, big, ancient,  proto-birds we call dinosaurs die out? We have a pretty good idea. Most extinctions that have happened on our planet were a consequence of climate change. For the dinosaurs, it really was a meteorite strike. Probably in June. We know this because of fish. Here’s more from Popular Science:

By comparing living sturgeon to sturgeon fossils from Tanis, they found that in a fin spine, regular layering at a scale of millimeters shows the fish died when it was seven years old. The growth rings confirm the fish alternated between fresh waters in summer months and saline waters in winter. In this and other specimens analyzed in the same study, the last growth increment matches the transition from spring to summer.

Taken together, this suggests the meteorite struck in May or June, being the cusp of spring and summer in the northern hemisphere.

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