|
Juan Armenta
Camacho (left) "[The Valsequillo
Prehistoric Zone]...has suffered from severe erosion which has uncovered
very old terrain in which outcrops of the calcareous marine basement rock
(Cretaceous) stand out, and upon which rests a calcareous conglomerate, tuff
layers, and alluvial and lacustrine sediments of undetermined age, and higher
[in the section] consolidated stratified tuff layers called "xalnene", which
underlie a thick sedimentary section of lacustrine deposits called "Tetela
Formation", which has lenses of [Valsequillo] gravel[s] and is rich in the
remains of Quarternary mammals..." Traces of
Human Workmanship on Extinct Animal Bone from Valsequillo, Puebla, Mexico |
