Also known as USGS 13754

Where: Tamaulipas, Mexico (26.3° N, 98.8° W: paleocoordinates 27.4° N, 91.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Roma Sandstone Member (Jackson Formation), Late/Upper Eocene (37.2 - 33.9 Ma)

• The Jackson Group of Mexico and the Gulf Coastal Plain is here considered as a formation. The Jackson Formation can be subdivided into three members, the basal "Roma Sandstone" and middle and upper members (no lithostratigraphic name). No comments are made on relations to Gulf Coastal Plain units, but the enterer considers that the Jackson Formation of this collection is equivalent in age (late Eocene) as the Jackson Group (Gulf Coastal Plain).

• bed-level stratigraphic resolution

Environment/lithology: coastal; poorly lithified, fine-grained, gray sandstone

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 43062: authorized by Austin Hendy, entered by Austin Hendy on 09.08.2004

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)