The Day The Mesozoic Died

It talked about how the dinosaurs died and how living things came back after the extinction. There was an astroid that hit the earth and they all died, but some smaller animals survived. They used rocks as evidence to show exactly how the astroid destroyed everything. Not a lot of people believed the guy, so he had to do more researching and eventually, they found exactly where the astroid is. There are boundaries and all of them so far have been found under a certain one. That shows that almost no living thing survived the astroid.