Also known as USGS 13564
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 42991: authorized by Austin Hendy, entered by Austin Hendy on 07.08.2004
Creative Commons license: CC BY (attribution)