Stratigraphy of the Cretaceous Hornbrook Formation, southern Oregon and northern California a stratigraphic division of the Hornbrook Formation into five nonmarine and marine members - Nilsen, Tor Helge 1941- (U.S. Government Print. Office, 1993)
Keywords: Geologie; Geology -- California; Geology -- Oregon; Geology, Stratigraphic -- Cretaceous; Hornbrook Formation (Calif. and Or.); Hornbrook-Formation; Kalifornien -- Nord; Oregon -- Süd