
Environment Story Of The Day NPR hide caption
Finding Fossils Along U.S. Freeways
Geologic pressures force ancient layers of rock above ground, exposing their cargo of fossils. Paleontologist Kirk Johnson and artist Ray Troll search the western United States for fossils and chronicle their finds in a new book, Cruisin' the Fossil Freeway.
Johnson and Troll speak with Andrea Seabrook.