[vpintheak]

Can’t be, It was a comet! A comet I tell you! wait no, it was an Ice age! An Ice age I tell you! This will do until we change our minds again.....

[decimon]

Can’t be, It was a comet! A comet I tell you! wait no, it was an Ice age! An Ice age I tell you!

What we have here is a failure of extinction distinction.

[Lucius Cornelius Sulla]

Comet was K-T extinction, end of the Dinosaurs, some think Vulcanism about the same time in India is now thought to have at least help out.

This one is the P-T extinction end of the mammal like reptiles, giving rise to the dinosaurs.