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Portions of first page A North Dakota Triceratops skull F. D. HOLLAND, JR. , University of North Dakota ABSTRACT A dinosaur skull, from the upper Hell Creek Formation, Late Cretaceous in age collected in 1964 in southwestern North Dakota... The skull is thought to be from a mature female... Forster (1996b) accepted two species of Triceratops as valid, T. horridus and T. prorsus. Consideration of her studies suggests that the skull is correctly identified. Contributions to Geology, University of Wyoming. v. 32, December, 1997