Also known as USGS 13742

Where: Tamaulipas, Mexico (26.4° N, 99.2° W: paleocoordinates 30.1° N, 85.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Upper Member (Indio Formation), Early/Lower Eocene (55.8 - 48.6 Ma)

• The Indio Formation of south Texas, characterised by play or slabby sandstones and thin-bedded sandy shale and clay, is rpesent in Mexico, with an estimated thickness of more than 3000 ft. The Indio Formation shows faunal similarity with the Tuscahoma and Bashi Formations of Alabama. The Indio Formation is subdivided into three members. The collection is derived from the upper member. Upper member of the Indio Formation is as a rule an indurated gray-blue calcareous sandstone, rather fine-grained, micaceous, and commonly jointed or cross-bedded. The collection however comes from a 0.5-8 inch oyster bed.

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, concretionary, pebbly, shelly/skeletal conglomerate

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 42934: authorized by Austin Hendy, entered by Austin Hendy on 07.08.2004

Creative Commons license: CC BY (attribution)