Imlay, R. W. (1968). Lower Jurassic (Pliensbachian and Toarcian) ammonites from eastern Oregon and California: Ammonite faunas of Mediterranean affinities characterize the upper part of Lower Jurassic sequences in Oregon and California. United States Government Print. Office.
Chicago-Zitierstil (17. Ausg.)Imlay, Ralph W. Lower Jurassic (Pliensbachian and Toarcian) Ammonites from Eastern Oregon and California: Ammonite Faunas of Mediterranean Affinities Characterize the Upper Part of Lower Jurassic Sequences in Oregon and California. Washington, DC: United States Government Print. Office, 1968.
MLA-Zitierstil (9. Ausg.)Imlay, Ralph W. Lower Jurassic (Pliensbachian and Toarcian) Ammonites from Eastern Oregon and California: Ammonite Faunas of Mediterranean Affinities Characterize the Upper Part of Lower Jurassic Sequences in Oregon and California. United States Government Print. Office, 1968.