Middle Jurassic (Bajocian) ammonites from eastern Oregon
By: by Ralph W. Imlay.
Series: Geological Survey professional paper 756
Publisher: U.S. Govt. Print. Off.
Published: 1973
Place of publication: Washington
Language: eng
Number of pages: 100
Subjects: Ammonoidea -- Oregon.; Paleontology -- Jurassic.; Paleontology -- Oregon.
Description: Additional title page description: Bajocian ammonites of eastern Oregon greatly resemble those of Alaska and Europe, indicate marine connections with Europe, and permit accurate zonal dating in the Pacific Coast region.
Notes: Bibliography: p. 92-95.
Part of illustrative matter in pocket.