Rancho Las Barretas: Late/Upper Maastrichtian, Mexico
collected by G. Barbosa Navéjar, S. Navéjar Torres, and A. Navéjar Ruiz 2001

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Mosasauridae
Mosasauridae indet. Gervais 1852
Reynoso and Cruz 2014 1 individual
UANL-FCT-R4
see common names

Geography
Country:Mexico State/province:Nuevo Leon
Coordinates: 25.0° North, 99.5° West (view map)
Paleocoordinates:31.0° North, 79.8° West
Basis of coordinate:stated in text
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
Key time interval:Late/Upper Maastrichtian
Age range of interval:70.60000 - 66.00000 m.y. ago
Stratigraphy
Formation:Mendez
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: "shale"
Secondary lithology: marl
Includes fossils?Y
Includes fossils?Y
Lithology description: 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).
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection excludes:all microfossils
Collection methods:survey of museum collection
Collection size:1 specimens
Reason for describing collection:general faunal/floral analysis
Collectors:G. Barbosa Navéjar, S. Navéjar Torres, and A. Navéjar Ruiz Collection dates:October and November of 2001
Metadata
Database number:151073
Authorizer:M. Uhen, M. Carrano Enterer:C. Peredo, M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:2013-09-20 02:48:33 Last modified:2022-07-01 12:01:38
Access level:the public Released:2013-09-20 02:48:33
Creative Commons license:CC BY
Reference information

Primary reference:

48231. 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]

Secondary references:

82053 V. H. Reynoso and J. A. Cruz. 2014. Mesozoic lepidosauromorphs of Mexico: a review and discussion of taxonomic assignments. In H. E. Rivera-Sylva, K. Carpenter, & E. Frey (eds.), Dinosaurs and Other Reptiles from the Mesozoic of Mexico 44-78 [M. Carrano/M. Carrano]