This activity booklet is part of a series highlighting fossils of prehistoric life, and the ecosystems where they lived, that are found on national forests and grasslands. "Last of the Dinosaurs" looks at the Hell Creek Formation in present-day Wyoming, Montana, North Dakota, and South Dakota. The iconic animals that thrived in this region—like T. Rex and Triceratops—were the last dinosaurs to walk the Earth before a meteor impact brought an end to the Cretaceous period and most of the planet's life.

This poster highlights nine prehistoric creatures whose fossils are found on national forests and grasslands across the country. From a big cat in a Virginia cave to a one-of-a-kind crocodilian fossil on an Alaskan island, the fossil resources protected on our national forests and grasslands are truly amazing.