For a long time after the vast coal fields which extend around the southern extremity of the Rocky Mountains in southern Colorado and northern New Mexico, came under close surveillance of stratigrapher their deposition was regarded as having taken place during the closing epoch of the Cretacic Period. The great thickness of the associated strata were paralleled with the enormously thick Laramie coal-bearing beds of Wyoming and Montana. On this point a voluminous literature appeared to be in general agreement.
Proceedings of the Iowa Academy of Science
©1922 Iowa Academy of Science, Inc.
"Laramian Hiatus around the Southern Rockies,"
Proceedings of the Iowa Academy of Science, 29(1), 101-103.
Available at: https://scholarworks.uni.edu/pias/vol29/iss1/13