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Foraminiferal biostratigraphy and petrography of the Lower Pen Formation (Upper Cretaceous), Big Bend Region, Trans-Pecos Texas
(Texas Tech University, 2003-12)
In the Big Bend region of Trans-Pecos Texas, Upper Cretaceous pelagic marine limestone of the Boquillas Formation is overlain by marine shale of the Pen Formation. This transition from predominately carbonate sedimentation ...