Fossil Ridge

What is Fossil Ridge?

Did you know that the entire state of Colorado was once at the bottom of a vast, life-supporting sea? Take a trip back in time to Kremmling’s Fossil Ridge, also known as the Kremmling Cretaceous Ammonite Locality, and discover the remains of aquatic creatures who once inhabited this ancient ocean.

Fossil Ridge is a ridge in Kremmling, Colorado, where the sandstone slabs feature over 100 invertebrate species. As you walk along the sagebrush-spotted landscape, you’ll come across exceptionally large and well-preserved fossils of giant ammonites, nautiloids, bivalves, gastropods and beyond — all over 72.5 million years old. The fossils found here are the largest specimens of this Cretaceous group known in North America. Exceptionally diverse fossil biota, including rare tropical and subtropical forms represent an unusual fossil assemblage in size.
As you hunt for fossils on this incredible hike, remember to roam responsibly. Always leave natural spaces as you find them.