Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #7: Niobrara, Pierre Shale Formation

Prev | Index For This Date | Next

Close up of Platyceramus showing prism crystal structure of fossil.  Niobrara formation, Smoky Hills member.
Prev | Index For This Date | Next

Close up of Platyceramus showing prism crystal structure of fossil. Niobrara formation, Smoky Hills member.