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Bivalve Associations Of The Cannonball Formation (Paleocene, Danian) Of North Dakota, Rosanne M. Lindholm
Bivalve Associations Of The Cannonball Formation (Paleocene, Danian) Of North Dakota, Rosanne M. Lindholm
Theses and Dissertations
The Cannonball Formation (Paleocene, 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), upper-middle (mudstone), and upper (sandstone). The Cannonball is also exposed in southwestern North Dakota where it occurs as two mudstone tongues (upper and lower).
During July and August, 1982, thirteen Cannonball outcrops were studied. Bivalves, along with other macrofossils, were collected quantitatively in an attempt to determine fossil species dominance. Rock samples were also collected and analyzed for textural …