Also known as USGS 13560
Where: Nuevo Leon, Mexico (25.9° N, 99.2° W: paleocoordinates 27.9° N, 89.7° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Lower Member (Laredo Formation), Middle Eocene (48.6 - 37.2 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 name Laredo Formation replaces the "Cook Mountain Formation" in the Rio Grande embayment. The Laredo Formation is divided into three members: lower, middle and upper. The collection is from the lower member.
• bed-level stratigraphic resolution
Environment/lithology: marine; 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 42990: authorized by Austin Hendy, entered by Austin Hendy on 07.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Pseudoliva santander true whelk | |
Personella septemdentata Gabb 1860 triton shell | |
| |
Bivalvia | |
"Ostrea sellaeformis" = Cubitostrea sellaeformis
"Ostrea sellaeformis" = Cubitostrea sellaeformis Conrad 1832 oyster | |
Pholadomya claibornensis Aldrich 1886 clam |