Title from title screen (viewed October 6, 2014).
"Unconformities, correlation, and nomenclature of some Triassic and Jurassic rocks, western interior, United States."
"Marked rapid lateral changes in lithology, fossil content, and thickness of the Stump Formation are due principally to erosion associated with the Cretaceous (K) and Jurassic (J-4) unconformities."