Title: Observations on the Cenomanian (upper Cretaceous) ammonite Calycoceras (Calycoceras) obrieni Young, 1957 from Arizona and New Mexico
First published: 1990
Subjects: Ammonoidea, Paleontology
Places: West (U.S.), Arizona, New Mexico
Time periods: Cretaceous
LC classification: QE75 .B9 no. 1881, QE746 .B9 no. 1881