Doughnut Formation

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The Doughnut Formation is an Upper Mississippian geologic unit in the western United States. Fish fossils have been discovered in shale outcrops of this formation in Dinosaur National Monument. [1]

Footnotes

  1. "Bighorn Canyon National Recreation Area, Dinosaur National Monument and Buffalo National River (additional Mississippian fossil fish)," Hunt, Santucci, and Kenworthy (2006); page 64.

References