Jurassic-Lower Cretaceous lithostratigraphic nomenclature for the Danish Central Trough /

København : I kommission hos C.A. Reitzels forlag, 1986

Jurassic (Oxfordian and Late Callovian) ammonites from the western interior region of the United States /

by Imlay, Ralph W. (Ralph Willard), 1908-1989
Washington : U.S. G.P.O., 1982

Permian to Jurassic redbeds of the Williston Basin /

by Carlson, C. G. (Clarence Gustav)
Bismarck, ND : North Dakota Geological Survey, 1993