Ammonites of early cretaceous age (Valanginian and Hauterivian) from the Pacific coast states Imlay, Ralph W. (Ralph Willard) 1908-1989 creator author. Geological Survey (U.S.) issuing body. text bibliography dcu 1960 monographic eng remote 1 online resource (106 unnumbered pages) : illustrations, maps + 1 plate. by Ralph W. lmlay. Title from title screen (viewed September 30, 2014). "The ammonite succession provides correlations within the Pacific Coast States and with other areas. This suggests that Cretaceous strata in California and Oregon rest disconformably on Jurassic strata." Includes bibliographical references (pages 221-223) and index. n-us-wa n-us-or n-us-ca Ammonoidea California Ammonoidea Oregon Ammonoidea Washington (State) Geology, Stratigraphic Cretaceous Paleontology Cretaceous Paleontology California Paleontology Oregon Paleontology Washington (State) Ammonoidea Cretaceous Geologic Period Geology, Stratigraphic Paleontology California Oregon Washington (State) From 65 to 140 million years ago fast I 19.16:334-F I 19.16:334-F Ammonites of early cretaceous age (Valanginian and Hauterivian) from the Pacific coast states Imlay, Ralph W. (Ralph Willard), 1908-1989. (OCoLC)3161678 Geological Survey professional paper ; 334-F Shorter contributions to general geology https://purl.fdlp.gov/GPO/gpo86725 COP 141006 20211120182644.0 in00003972663 eng