This legislation, known as the National Fossil Act , proposes to officially recognize two prominent prehistoric creatures as national symbols. Specifically, it designates the American mastodon (Mammut americanum) as the national fossil mammal of the United States, acknowledging its historical significance. Concurrently, the bill establishes the Tyrannosaurus rex as the national fossil dinosaur, highlighting its iconic status in paleontology. To implement these designations, the bill amends chapter 3 of title 36, United States Code, by adding a new section. This amendment ensures the formal inclusion of these national fossil symbols within the existing framework for national observances and designations, thereby celebrating the nation's rich paleontological heritage.