Also known as USGS 13989

Where: Tamaulipas, Mexico (26.4° N, 99.2° W: paleocoordinates 28.4° N, 89.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mount Selman Formation (Claiborne Group), Middle Eocene (47.8 - 37.7 Ma)

• The succession of Claiborne Group in northeastern Mexico is exceptionally thick and well correlated to those units of the same name in Texas on the basis of faunal similarity. The Mount Selman Formation includes of 2,500 ft of sediments, mostly shales and sandstones. The formation is correlated to the Lisborn Formation of the Gulf Coast. The scattered outcrops are mostly barren.

• bed-level stratigraphic resolution

Environment/lithology: marine; sandstone and shale

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 42972: authorized by Austin Hendy, entered by Austin Hendy on 07.08.2004

Creative Commons license: CC BY (attribution)