IGM 2587 - Northwestern margin of Escondida syncline (Eocene of Mexico)

Where: Mexico (26.2° N, 101.1° W: paleocoordinates 30.1° N, 87.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Adjuntas Formation, Ypresian (56.0 - 47.8 Ma)

• bed-level stratigraphic resolution

Environment/lithology: delta plain; sandstone and sandy siltstone

• Marsh and delta plain deposits.
• Red and brown sandstones and sandy siltstones containing oyster banks. 70m above the base there is a brown sandstone bed in which a gray claystone lentil contains bryozoans,oyster fragments,and the gastropods.

Size classes: macrofossils, mesofossils

Primary reference: F. J. Vega and M. D. C. Perilliat. 1992. Freshwater Gastropods from Early Eocene Difunta Group, Northeastern Mexico. Journal of Paleontology 66(4):603-609 [N. Bonuso/P. Monarrez/P. Monarrez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144400: authorized by Nicole Bonuso, entered by Pedro Monarrez on 07.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Naticidae
Natica sp.
Natica sp. Scopoli 1777 moon snail
 Cerithioidea - Pachychilidae
? Melanatria sp.
? Melanatria sp. Bowdich 1822 snail
 Cerithioidea - Thiaridae
Hemisinus (Longiverena) adjuntaensis n. sp., Hemisinus (Longiverena) reticulosus n. sp.
Hemisinus (Longiverena) adjuntaensis n. sp. Vega and Perilliat 1992 snail
Hemisinus (Longiverena) reticulosus n. sp. Vega and Perilliat 1992 snail