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Nodosaurid material from Mexico



From: Ben Creisler
bh480@scn.org

The text of this paper is finally available. The pdf is 
free.

Héctor E. Rivera-Sylva, Kenneth Carpenter, and Francisco 
Javier Aranda-Manteca (2011)
Late Cretaceous Nodosaurids (Ankylosauria: Ornithischia) 
from Mexico. 
Revista Mexicana de Ciencias Geológicas 28(3): 271-278
http://satori.geociencias.unam.mx/en_prensa/(04)
RiveraSylva.pdf

Nodosaurid ankylosaur remains from the Upper Cretaceous 
of Mexico are summarized. The specimens are from the El 
Gallo Formation of Baja California, the Pen and Aguja 
Formations of northwestern Coahuila, and the Cerro del 
Pueblo Formation of southeast Coahuila, Mexico. These 
specimens show differences from other known nodosaurids, 
including an ulna with a well developed olecranon and 
prominent humeral notch, the distal end of the femur not 
faring to the extent seen in other nodosaurids, and a 
horn-like spine with vascular grooves on one side. The 
specimens represent the southernmost occurrences of 
nodosaur remains in North America, and provide an 
important biogeographical link between nodosaurids of the 
United States and Canada on the one hand, and Argentina 
and Antarctica on the other.