Cobban, William A.
Upper Cretaceous (Maastrichtian) Ammonites from the Nostoceras alternatum zone in southwestern Arkansas - Washington, D.C. U.S. Geological Survey 1991 - pp. E1-E6
Titulo del Bulletin n°1985: Shorter contributions to Paleontology and Stratigraphy
AMMONOIDEA
CRETACEO
ESTADOS UNIDOS
Upper Cretaceous (Maastrichtian) Ammonites from the Nostoceras alternatum zone in southwestern Arkansas - Washington, D.C. U.S. Geological Survey 1991 - pp. E1-E6
Titulo del Bulletin n°1985: Shorter contributions to Paleontology and Stratigraphy
AMMONOIDEA
CRETACEO
ESTADOS UNIDOS