El Sombrero Ranch (Jurassic of Mexico)

Also known as Sierra de Parras

Where: Coahuila, Mexico (25.1° N, 101.5° W: paleocoordinates 20.9° N, 52.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Crassicolaria massutiniana other zone, La Caja Formation, Late/Upper Tithonian (150.8 - 145.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; nodular, calcareous lithology not reported

• calcareous nodule

Size class: macrofossils

Collected by Don Rodolfo Medellin González and teams from the MUDE in 2008

Primary reference: M.-C. Buchy and J. G. López Oliva. 2009. Occurrence of a second ichthyosaur genus (Reptilia: Ichthyosauria) in the Late Jurassic Gulf of Mexico. Boletín de la Sociedad Geológica Mexicana 61(2):233-238 [P. Mannion/P. Mannion]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 138712: authorized by Philip Mannion, entered by Philip Mannion on 25.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ichthyosauria - Ophthalmosauridae
Ophthalmosauridae indet. Appleby 1956 ichthyosaur
CPC 307 (MUDE) - long calcareous nodule fragmented by local tectonics, enclosing the skull, dorsal vertebral column and partial ribs; an additional, smaller nodule here considered comprises the partial pectoral girdle (both coracoids, right scapula and possibly one clavicle preserved as a partial imprint) and partial right forelimb