Stratigraphy and Paleontology of the Upper Cretaceous Beds Along the Eastern Side of Laguna de Mayran, Coahuila, Mexico |
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Anticline Aperture beak beds body whorl Boquillas calcite carina Cerro El Pozo Cerro Mojica Coahuila Coll Conrad constricted Contralvo Anticline costae Cuesta Difunta dark gray DESCRIPTION Difunta formation Exogyra DIFUNTA FORMATION FIGURES Dimensions dorsal margin Exogyra ponderosa zone Exogyra ponderosa zone):-El feet figs Figures natural fold formation Exogyra ponderosa FOSSILS Gabb gastropods Genus growth lines Gyrodes Hacienda height hills hinge-line HOLOTYPE Holotype Univ incurved Inoceramus internal mold Left valve Univ length light gray limestone Lissapiopsis LOCALITY maximum diameter Mexico miles moderately Museum of Paleontology north flank OCCURRENCE Paratype pelecypods Plate ponderosa zone):-El Pozo-Boquillas poorly preserved posterior margin posteriorly prominent ribs Right valve Univ San Ignacio Sandstone Santonian Shale shaly shaly sandstones shell slightly species specimens Spire Stephenson subovate Surface marked Surv Suture syncline thick thick-bedded sandstones thin-bedded Turonian U. S. Geol umbonal University of Michigan Upper Cretaceous ventral margin view Univ zone):-El Pozo-Boquillas area