• Knightia eocaena mass mortality

    Fossil Butte

    National Monument Wyoming


Beaver ponds are located near springs that surface at the contact of the Green River and Wasatch Formations.  The ponds provide ideal habitat for amphibians like this northern leopard frog.

Northern leopard frog.

NPS photo by Clay Kyte

Only three species of amphibians are documented: the Utah tiger salamander (Ambystoma tigrinum), chorus frog (Pseudacris triseriata maculata), and northern leopard frog (Rana pipiens).

Did You Know?

visitor center mural

Plant fossils, like palm fronds, tell us that 50 million years ago, southwest Wyoming's climate was much like Florida's is today.