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Showing 1 to 1 of 1 for “"Concretions; Geology--North Dakota"”.
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Concretions and nodules in the Hell Creek Formation, southwestern North Dakota
… Formation (Upper Cretaceous) in southwestern North Dakota consists of lagoonal and floodplain deposits and contains abundant concretions and nodules. Representative specimens of the concretions and nodules and their corresponding enclosing sediments were analyzed by thin section and by …