Rancho Las Barretas (Cretaceous of Mexico)

Where: Nuevo Leon, Mexico (25.0° N, 99.5° W: paleocoordinates 31.0° N, 79.8° W)

• coordinate stated in text

When: Mendez Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; shale and marl

• The unit is up to 1,000 m thick and consists of rhythmically bedded marls, shales, and minor sandstones. These were deposited in an open marine shelf environment in water depths of approximately 100 m near Los Ramones, 40 km north-east of Monterrey, and more than 400 m in the La Sierrita region, 40 km east of Montemorelos (Keller et al., 1997; Stinnesbeck et al., 2001). Planktic and benthic foraminiferal assemblages are rich and diverse throughout the Méndez Formation, whereas macrofossils, like inoceramids, ammonites, and vertebrate remains, are rare and known only from a few locations (Ifrim et al., 2004).

Size class: macrofossils

Collected by G. Barbosa Navéjar, S. Navéjar Torres, and A. Navéjar Ruiz in 2001

Primary reference: M. C. Buchy, E. Frey, W. Stinnesbeck and J. G. Lopez-Olivia. 2007. Cranial anatomy of a Maastrichtian (Upper Cretaceous) mosasaur (Squamata, Mosasauridae) from north-east Mexico. Revista Mexicana de Ciencias Geologicas 24(1):89-103 [M. Uhen/C. Peredo]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 151073: authorized by Mark Uhen, entered by Carlos Peredo on 20.09.2013, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Squamata - Mosasauridae
Mosasauridae indet.
Mosasauridae indet. Gervais 1852 mosasaur
UANL-FCT-R4