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

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Stop #7 - Niobrara formation, Smoky Hills member. Limestone shales, also deep in the Western Interior Seaway with abundant marine fossils. This image shows cracking, slipping and recementing with calcite that occurred much later in time. Light color indicates more carbonate ( > 50%) than mud.
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Stop #7 - Niobrara formation, Smoky Hills member. Limestone shales, also deep in the Western Interior Seaway with abundant marine fossils. This image shows cracking, slipping and recementing with calcite that occurred much later in time. Light color indicates more carbonate ( > 50%) than mud.