Columbia subject headings:
Geology, Stratigraphic--Cretaceous.
Geology--West (U.S.)
Paleoecology--West (U.S.)
Harvard subject headings:
Geology, Stratigraphic--Cretaceous
Geology--West (U.S.)
Paleoecology--West (U.S.)
Princeton subject headings:
Geology, Stratigraphic--Cretaceous.
Geology--West (U.S.)
Paleoecology--West (U.S.).