Rock Layers, Fox Hills Formation



							These deposits accumulated at the margin of the retreating Cretaceous Western Interior Seaway, the remains of ancient beaches, and shallow marine sand layers. Typical fossils include clams and the burrows of shoreline shrimp. A) Fossil clam. B) Outcrop on Rooney Road near Golden. C) When the Fox Hills Formation was being deposited, Denver was waterfront property.

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