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

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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.
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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.



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