Paleo Sleuths: Saber-Toothed Tigers, Mastodons, and the Rise of Mammals (2016)

Paleontologists, notably Michael Voorhies, have uncovered fossils of hundreds of mammal species in Nebraska. For millions of years recurring super volcano eruptions doomed entire populations of animals. Then, over that past few thousand years, rivers had eroded the volcanic ash revealing the ancient fossil beds that now tell the stories of the evolution of many mammal families.