Category:Morrison Formation

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English: The Morrison Formation is a sequence of Late Jurassic sedimentary rock that is found in the western United States.
  • It is centered in Wyoming and Colorado, with outcrops in Montana, North Dakota, South Dakota, Nebraska, Kansas, the panhandles of Oklahoma and Texas, New Mexico, Arizona, Utah, and Idaho. *Equivalent rocks, under different names, are found in Canada.
  • It covers an area of 1.5 million square km (600,000 square miles), although only a tiny fraction is exposed and accessible to geologists and paleontologists. Over 75% is still buried under the prairie to the east and much of the rest was destroyed by erosion as the Rocky Mountains rose to the west.


This category has the following 4 subcategories, out of 4 total.