Upper Cretaceous heteromorph ammonites from the Baculites compressus zone of the Pierre shale in north-central Colorado
By: by William A. Cobban, W. James Kennedy, and Glenn R. Scott.
Contributors: Kennedy, W. J.; Scott, Glenn Robert, 1918-
Series: U.S. Geological Survey bulletin -- 2024-A; Shorter contributions to paleontology and stratigraphy -- 1992
Publisher: U.S. G.P.O.
Published: 1993
Place of publication: [Washington
Language: eng
Number of pages: 11
Subjects: Ammonoidea -- Colorado -- Grand County.; Paleontology -- Cretaceous.; Paleontology -- Colorado -- Grand County.
Notes: "Descriptions and illustrations of an unusual ammonite assemblage of both Western Interior and Gulf Coast aspects."

Includes bibliographical references (p. 9-11).