Columbia subject headings:
Harvard subject headings:
Dinosaurs--South America.
Mammals--Evolution
Paleontology--Paleocene
Paleontology--South America
Stratigraphic correlation--South America.
Princeton subject headings:
Dinosaurs--South America.
Paleontology--Cretaceous.
Paleontology--Paleocene.
Paleontology--South America.
Ungulates, Fossil.