USGS 13758 - Nuevo Leon, Mexico (Midway Formation) (Paleocene of Mexico)

Also known as USGS 13758

Where: Nuevo Leon, Mexico (25.7° N, 99.2° W: paleocoordinates 30.1° N, 84.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Upper Member (Midway Formation), Late/Upper Paleocene (58.7 - 55.8 Ma)

• The Midway Formation of northeastern Mexico is divided into upper and lower divisions (members). The lower member roughly correlates to the Wills Point, Naheola, and Porters Creek Formations of the Gulf Coastal Plain. Collections show little faunal similarity to any Gulf Coast units.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, shelly/skeletal, gray, argillaceous, calcareous sandstone

• Siliciclastic. No paleoenvironmental data reported.
• Fine, pearly-gray calcareous and argillaceous sandstones veined with black calcite and is highly fossiliferous.

Size class: macrofossils

Reposited in the USNM

Collection methods: quarrying,

• Collections reposited in USGS and USNM collections.

Primary reference: J. Gardner. 1945. Mollusca of the Tertiary formations of Northeastern Mexico. Geological Society of American Memoir 11 [M. Kosnik/M. Kosnik/M. Kosnik]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 42924: authorized by Austin Hendy, entered by Austin Hendy on 07.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for mollusca.
Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Ficidae
Priscoficus (Fulguroficus) ? juvenis
Bivalvia
 Ostreida - Ostreidae
Ostrea ? eothirsae