Toarcian (early Jurassic) ammonoids from western North America
By: G.K. Jakobs.
Series: Bulletin / Geological Survey of Canada -- 428; Bulletin (Geological Survey of Canada) -- 428.
Publisher: Geological Survey of Canada
Published: 1997
Place of publication: Ottawa, Ont
Language: eng
Number of pages: 137
Subjects: Ammonoidea -- Canada, Western; Ammonoidea -- West (U.S.); Paleontology -- Jurassic
Notes: Includes bibliographical references (p. 63-69).

Abstract and summary also in French.