E. D. Cope. 1876. Descriptions of some vertebrate remains from the FortUnion Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia
(2002). "Magnetostratigraphy and geochronology of the Hell Creek and basal FortUnion Formations of southwestern North Dakota and a recalibration of the Cretaceous–Tertiary
(原始内容存档于2012-06-06). Fuis, G.S. (1996). The geology and mechanics of formation of the Fort Rock dome, Yavapai County, Arizona [U.S. Geological Survey Professional