Abstract
Dinoflagellate assemblages from the Turtle Mountain core hole provide evidence for the Paleocene age of the Turtle Mountain Formation and confirm that the Boissevain Formation and the Coulter Member of the Pierre Formation are Maastrichtian. Evidence from dinoflagellates suggests that the Odonah Member of the Pierre Formation is late Campanian. The dinoflagellate assemblages indicate that nearshore shallow marine conditions were present at times during deposition of all the formations.
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