The beginning of the age of mammals in South America. Part 2, Systematics : Notoungulata, concluded (Typotheria, Hegetotheria, Toxodonta, Notoungulata incertae sedis), Astrapotheria, Trigonostylopoidea, Pyrotheria, Xenungulata, Mammalia incertae sedis. Bulletin of the AMNH ; v. 137

Simpson, George Gaylord, 1902-2005-11-222005-11-221967http://hdl.handle.net/2246/1621259 p., 46 p. of plates : ill. ; 27 cm.Includes bibliographical references (p. 251-254) and index.87457497 bytesapplication/pdfen-USQH1 .A4 vol.137, 1967Mammals, Fossil -- Patagonia (Argentina and Chile)Mammals, Fossil -- Argentina -- Chubut.Paleontology -- Tertiary -- Patagonia (Argentina and Chile)Paleontology -- Tertiary -- Argentina -- Chubut.Paleontology -- Patagonia (Argentina and Chile)Paleontology -- Argentina -- Chubut.The beginning of the age of mammals in South America. Part 2, Systematics : Notoungulata, concluded (Typotheria, Hegetotheria, Toxodonta, Notoungulata incertae sedis), Astrapotheria, Trigonostylopoidea, Pyrotheria, Xenungulata, Mammalia incertae sedis. Bulletin of the AMNH ; v. 137Age of mammals in South Americatext