New and little-known ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the western interior of the United States /
Cobban, William A. 1916-
New and little-known ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the western interior of the United States / by William A. Cobban. - Washington: United States Government Printing Office, 1971. - iii, 24 p., 18 plates : ill., maps, tables ; 29 cm. - 699 .
Includes bibliographical references (p. 20-22) and (p. 23-24).
A species each of Anisoceras, Desmoceras, Tragodesmoceras, Calycoceras, Nigericeras, and Paracompsoceras, (new genus) is descriped and illustrated.
Ammonoidea--West (U. S.)
Paleontology--Cretaceous
Paleontology--West (U. S.)
564.530978
New and little-known ammonites from the Upper Cretaceous (Cenomanian and Turonian) of the western interior of the United States / by William A. Cobban. - Washington: United States Government Printing Office, 1971. - iii, 24 p., 18 plates : ill., maps, tables ; 29 cm. - 699 .
Includes bibliographical references (p. 20-22) and (p. 23-24).
A species each of Anisoceras, Desmoceras, Tragodesmoceras, Calycoceras, Nigericeras, and Paracompsoceras, (new genus) is descriped and illustrated.
Ammonoidea--West (U. S.)
Paleontology--Cretaceous
Paleontology--West (U. S.)
564.530978