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Stratigraphy of the Pierre Shale, Valley City and Pembina Mountain Areas, North Dakota
From abstract: Reconnaissance examination of widely scattered outcrops of Upper Cretaceous rocks in the heavily glaciated areas of eastern North Dakota provides the basis for the first formal subdivision of the Pierre Shale in these areas.
Date:
1965
Creator:
Gill, James R. & Cobban, William Aubrey
System:
The UNT Digital Library