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

Prev | Index For This Date | Next
Tan/yellow line is a layer of volcanic ash. The ash came fell on the surface of the ocean and settled to the bottom. Volcanic ash is a great time marker because it can be accurately dated using radiometric techniques. Niobrara formation, Smoky Hills member.
Prev | Index For This Date | Next

Tan/yellow line is a layer of volcanic ash. The ash came fell on the surface of the ocean and settled to the bottom. Volcanic ash is a great time marker because it can be accurately dated using radiometric techniques. Niobrara formation, Smoky Hills member.