Bol. Soc. Geol. Mexicana, Tomo XLVII. No. 1. 1986

Gasterópodos del Cretácico (Aptiano Tardío-Albiano Temprano) del Cerro de Tuxpan, Jalisco

http://dx.doi.org/10.18268/BSGM1986v47n1a2

Blanca Estela Buitrón *

*Instituto de Geología. Universidad Nacional Autónoma de México.

Abstract

Twelve species of gastropods are described and illustrated [Otostoma japonicum (Nagao), Microschiza (Cloughtonia) scalaris (Conrad), Mesoglauconia (Mesoglauconia) burnsi (Stanton), M. (Triglauconia) kleinpelli (Allison) Gymnentome (Gymnentome) paluxiensis (Stanton), G. (G.) zebra (Gabb), Cassiope sp. ci. C. branneri (Hill), Pyra Zus (Echinobathra) valeriae (Verneuil and Lorière), P. (E.) vicinum (Verneuil and Lorière), Aptyxiella sp., A. supracostata (Stanton) and Ptygmatis tomasensis (Allison)] the most abundant family is Cassiopidae Kollmann, 1953, which is so well preserved as to show the original color pattern. This color pattern also occurs in Cassiope from Utrillas, Spain and northern Mexico.

The studied material was collected in outcrops of the Encino Formation (upper Aptian-lower Albian) at Cerro de Tuxpan, in Southern, Jalisco State.

Knowledge of these mollusks allows the establishment of specific affinities with other faunas of Mexico (Baja California Norte, Sonora and Michoacan), the United States of North America (Texas), Europe (Spain) and Asia (Syria, Lebanon and japan). Finally these gastropods lived in an environment of warm shallow water.