Ammonites in clasts of the Juana Lopez member of the Carlile Shale (upper Cretaceous) near Pueblo, Colorado
By: by William A. Cobban.
Series: U.S. Geological Survey bulletin -- 1837-E; Shorter contributions to paleontology and stratigraphy
Publisher: U.S. G.P.O.
Published: 1988
Place of publication: Washington
Language: eng
Subjects: Ammonoidea -- Colorado -- Pueblo County.; Bivalvia, Fossil -- Colorado -- Pueblo County.; Paleontology -- Cretaceous.; Paleontology -- Colorado -- Pueblo County.
Notes: "Unusually good external molds of mollusks date the clasts as middle late Turonian."

Includes bibliographical references (p. 4-5).