Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Cretaceous
Paleontology--Cretaceous
Paleontology--North America
Sedimentary rocks--North America.
Sedimentary rocks.
Princeton subject headings:
Geology, Stratigraphic--Cretaceous.
Geology--North America, western.
Petrology--North America, western.
Sedimentary rocks.