Callovian (Jurassic) ammonites from the United States and Alaska.
By: by Ralph W. Imlay.
Contributors: Geological Survey (U.S.)
Series: Geological Survey professional paper -- 249
Publisher: U.S. G.P.O.
Published: 1953
Place of publication: Washington
Language: eng
Number of pages: 39
Subjects: Ammonoidea -- United States.; Paleontology -- Jurassic.
Notes: "Descriptions and illustrations of cephalopods of Late Jurassic age."

Includes bibliographical references and index.