Preliminary Report on a Late Cretaceous Vertebrate Fossil Assemblage in Northwestern Coahuila, Mexico

Abstract

A new vertebrate fossil assemblage of Late Cretaceous age is reported here. This discovery represents the results of the 2007 and 2008 field seasons in the locality known as "Las Jicoteas" situated in the municipality of Ocampo, in northwestern Coahuila, Mexico.The stratigraphic sequence where this fossil fauna occurs can be correlated to the Lower Member of the continental Aguja Formation that outcrops in the neighbouring Big Bend region of Texas.This new fauna bears the first record of a nodosaur for Mexico, and, also additional dinosaur remains attributed to the families Tyrannosauridae and Hadrosauridae are recorded. Associated fossil taxa include lepisosteid fishes, turtles and crocodile remains.The palaeocological conditions inferred by this new faunal assemblage suggest a paralic system with prodelta, marshes, lagoons, and nearshore marine deposits.

Bite marks of a large theropod on an hadrosaur limb bone from Coahuila, Mexico

“…This is the second record of a bone bearing bite marks for the locality (Rivera-Sylva et al, 2009a), but this is the first attributed to a dinosaur. This also represents the first record of a tyrannosaurine in this locality, though a tyrannosaurid tooth is known from a nearby locality of the same formation (Rivera-Sylva et al, 2009b).…”

<i>Mamenchisaurus</i> tail club, again

“…A partial femur (Fowler and Sullivan 2011) suggests an element approaching those of Dreadnoughtus and Futalognkosaurus in length, and therefore a similar body mass. A tibia that may pertain to Alamosaurus (Rivera-Sylva et al 2006) also appears to be in this size class.…”

Los Hadrosaurios (Ornithopoda, Hadrosauroidea) Mexicanos: Una Revisión Crítica

“…El Gallo, en Baja California (Langstone & Oakes, 1954;Morris, 1981;Rodríguez de la Rosa, 1998;Hilton, 2003;García-Alcántara, 2016;Cabrera-Hernández et al, 2017;Cabrera-Hernández, 2018), Fm. Aguja, en Chihuahua y Coahuila (Montaño et al, 2009;Monroy-Mújica, 2009;Rivera-Sylva et al, 2009;Torres-Rodríguez et al, 2010;Westgate et al, 2002 a, b, c;Ramírez-Velasco et al, 2012;Ramírez-Velasco & Hernández-Rivera, 2015;Shiller, 2017); y la Fm. Cerro del Venegas Gómez, 2019).…”