Benavides-Cáceres, Victor E.2005-10-062005-10-061956http://hdl.handle.net/2246/1023p. 357-493, [36] p. of plates : ill., maps ; 27 cm.Thesis--Columbia University.Includes bibliographical references (p. 488-493).98581507 bytesapplication/pdfen-USQH1 .A4 vol.108, art.4, 1956Geology, Stratigraphic -- Cretaceous -- Peru.Geology -- Peru.Ammonoidea -- Peru.Mollusks, Fossil -- Peru.Paleontology -- Cretaceous -- Peru.Paleontology -- Peru.Cretaceous system in northern Peru. Bulletin of the AMNH ; v. 108, article 4Cretaceous system in Perutext