Table of Contents
Journal of Geological Research
Volume 2012, Article ID 808729, 7 pages
http://dx.doi.org/10.1155/2012/808729
Research Article

Lower Cretaceous Dinosaur Tracks from Puebla, Mexico

1Unidad Académica de Ciencias Biológicas, Universidad Autónoma de Zacatecas, Campus 2, 98060 Zacatecas, Mexico
2Museo de Paleontología, Centro de Investigaciones Biológicas, Universidad Autónoma del Estado de Hidalgo, Pachuca, C.P. 42184 Hidalgo, Mexico
3Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, C.P. 11340 México City, DF, Mexico

Received 2 August 2011; Accepted 7 November 2011

Academic Editor: David T. A. Symons

Copyright © 2012 Rubén A. Rodríguez-de la Rosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dinosaur tracks have been identified near San Martín Atexcal, southern Puebla, Mexico, within the sedimentary sequence of the San Juan Raya Formation of Lower Cretaceous (Albian) age. The tracksite, located in the bed of the Magdalena River, reveals six different ichnofossiliferous levels identified within a 9 m thick sedimentary sequence. The inferred environment is that of a tidal (marginal marine) mudflat (Level I). Level I preserves three theropods trackways (?Allosauroidea), additionally, isolated tracks belonging to iguanodontids (Ornithopoda). Level II preserves faint iguanodontid tracks. Levels III to V preserve sauropod tracks. Younger level VI preserves, although morphologically different, a track belonging to Ornithopoda. The dinosaur tracks from San Martín Atexcal support the existence of continental facies within the San Juan Raya Formation; they represent the second record of dinosaur tracks from the Lower Cretaceous of Mexico and are part of an important but little documented record of Lower Cretaceous dinosaurs in Mexico.