Guadalupian and Lopingian (Middle and Late Permian) deposits from Mexico and Guatemala, a review with new data

This work describes stage by stage the biostratigraphy of the Middle to Late Permian in Mexico and Guatemala. Roadian deposits are very poorly represented, as a consequence of tectonic movements at the end of the Kungurian/Leonardian stage. In fact Middle and Late Permian deposits are almost completely lacking in South Mexico and the whole Latin America, due to a probable climatic barrier. The main data concern the Las Delicias sequences from Coahuila, North Mexico, and the Mixteca Terrane, South central Mexico, with some precisions on the Wordian-Capitanian from Los Hornos (Puebla) and from Olinalá, Guerrero, respectively with the discoveries of Parafusulina sellardsi and Polydiexodina capitanensis. New data are provided on Capitanian mudmounds from Olinalá. A hypothetical reconstruction of the different terranes of Mexico at the Pangea stage, is finally presented.