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

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Niobrara formation, Fort Hays member: bowl-shaped clams called "Cremnoceramus" are very common. A crystal/prism structure can be seen on the edges of these broken clams.
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Niobrara formation, Fort Hays member: bowl-shaped clams called "Cremnoceramus" are very common. A crystal/prism structure can be seen on the edges of these broken clams.