Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #6: Benton, Niobrara Formations

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Stop #6: Benton formation, Carlile member (broken up gray materical in center of image). Gray micrite limestone from deep in the Western Interior Seaway. This sediment is mainly from small marine shells which you can easily see with a hand lens. The upper rock layer near top of image is the Fort Hays member of the Niobrara formation.
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Stop #6: Benton formation, Carlile member (broken up gray materical in center of image). Gray micrite limestone from deep in the Western Interior Seaway. This sediment is mainly from small marine shells which you can easily see with a hand lens. The upper rock layer near top of image is the Fort Hays member of the Niobrara formation.