TO GET TO THE SITE, FROM WARREN, MT. TRAVEL ALONG THE HELT ROAD, THEN GYPSPRINGS ROAD AND THEN CROOKED CK ROAD. BETTER CHOICE, FROM COWLEY, WY. TRAVEL TO CROOKED CK RD. CACHE IS A GREEN PLASTIC AMMO BOX IN A DRY WASH, THE WASH IS FULL OF FOSSILS.
Gryphaea, common name Devil's toenails, is a genus of extinct oysters, marine bivalve mollusks in the family Gryphaeidae.
These fossils range from the Triassic to the Tertiary periods, but are mostly restricted to the Triassic and Jurassic. Both periods belong to the era Mesozoic.
These oysters lived on the sea bed in shallow waters, known as the Sundance Sea, right where you are now standing, approximately 1.5 million years ago.