http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Ammonites of early cretaceous age (Valanginian and Hauterivian) from the Pacific coast states
"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 and index.
Professional paper (Geological Survey (U.S.)) ; 334-F
Shorter contributions to general geology