Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #7: Niobrara, Pierre Shale Formation
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![Niobrara formation, Smoky Hills member. Darker shales indicates more mud ( > 50%) than carbonates.](img_8198_std.jpg)
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Niobrara formation, Smoky Hills member. Darker shales indicates more mud ( > 50%) than carbonates.
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