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Preliminary report on the Pierre Shale in North Park, Colorado, and its correlation to Boulder, Middle Park, and Northwest Colorado
Dawn H. Madden
1979, Open-File Report 79-729
The Pierre Shale consists of interbedded marine shale and sandstone representing nearly continuous marine sedimentation during Late Cretaceous time. The Pierre Shale and time-equivalent marine units in the western interior United States contain 28 ammonite range zones. The ammonites show such rapid evolution and such wide geographic extent that their...