Xalnene Tuff footprints

The Xalnene Tuff footprints are a geological academic controversy, concerning a 2006 discovery of 269 markings in a geological layer in the Valsequillo Basin south of the city of Puebla, Mexico, which were originally interpreted to be human and animal footprints. The layer was variously dated to 40 000 years Before Present (BP) or 1.3 million year...
Found on http://en.wikipedia.org/wiki/Xalnene_Tuff_footprints
No exact match found