Abstract:In sediments of the Aguja Formation (Late Cretaceous: Campanian) at La Salada in northern part of the state of Coahuila, Mexico, numerous fossils of vertebrates have been discovered including Hadrosauridae. One hadrosaur vertebra provides evidence of predation probably by a giant alligator Deinosuchus riograndensis.Key Words: Coahuila; Mexico; Late Cretaceous; Campanian; Alligatoridae; Deinosuchus; Hadrosauridae; predation.

No 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.

No abstract

Los restos examinados consisten en un cráneo incompleto con las series P 2-M 3 y una mandíbula asociada con ambos I 2 y las series P 3-M 3 , parte anterior de una mandíbula aislada con el I 2 izquierdo y ambas series P 3-M 3 , una mandíbula aislada con la serie P 3-M 3 pero sin sínfisis, molares superiores aislados, dos magno derechos, un metacarpo III izquierdo y la primera falange del digito III derecho. Se observaron variaciones morfológicas en el material examinado que refleja diferencias de edad y/o sexo entre los individuos. Teleoceras hicksi se encuentra en la Cuenca de Tecolotán asociado con Dinohippus mexicanus, Nannippus aztecus, Neohipparion eurystyle, Astrohippus stockii y Borophagus secundus, por lo que la edad de la fauna corresponde al Henfiliano tardío.