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Showing 1 to 1 of 1 for “"Geology--North Dakota; Bivalves"”.
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Bivalve associations of the Cannonball Formation (Paleocene, Danian) of North Dakota
… Danian) is best exposed in southwest-central North Dakota. Here, two major lithotypes, mudstone and sandstone, occur. In this area, the Cannonball can be informally subdivided into four lithologic units: lower (primarily thinly-bedded sandstone and mudstone), lower-middle (sandstone), …