Discovery of Latest Devonian/Earliest Mississippian microfossils in San Salvador Patlanoaya (Puebla, Mexico); biogeographic and geodynamic consequences

Carbonate microfossils Petschoria (?), Kettnerammina, Kamaena, and Tolypammina (?) allow to biostratigraphically date the base of the sedimentary cover in San Salvador Patlanoaya (Puebla State, Mexico). They are indicative of the former Tournaisian, i.e. the Latest Devonian (Strunian) and the Earliest Mississippian Kinderhookian (= Hastarian). Deposits of this period are very poorly known in Mexico, and appear to be confined to a rift affecting only Patlanoaya, some areas of the Sonora and Chihuahua states (Mexico) and the Pedregosa Basin (New Mexico, USA). This rift is connected with the Rheic Ocean that opens, whereas the Antler Ocean is probably entirely closed in this period, as confirmed by the microfossil migration ways. To cite this article: D. Vachard, A. Flores de Dios, C. R. Geoscience 334 (2002) 1095–1101.