Boletín de la Sociedad Geológica Mexicana

Volumen 68, núm. 2, 2016, p. 313-321

 

Braquiópodos discínidos (Lingulida, Discinoidea) de la Formación Ixtaltepec, Carbonífero del área de Santiago Ixtaltepec, Oaxaca

Miguel Angel Torres-Martínez1,*, Francisco Sour-Tovar2

1Instituto de Geología, Departamento de Paleontología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510, CDMX, México.

2Museo de Paleontología, Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 CDMX, México.

* This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Abstract

Four species of discinid brachiopods of the genus Orbiculoidea present at different levels of the Ixtaltepec Formation, type section Arroyo las Pulgas, Nochixtlán Municipality, Oaxaca are described. Orbiculoidea caneyana and Orbiculoidea sp. were found in basal levels of the formation, in shale strata of chesterian age (Late Mississippian). The presence of Orbiculoidea missouriensis and Orbiculoidea capuliformis in upper stratigraphic levels, and also in argillaceous rocks of morrowan-desmoinesian age (Middle Pennsylvanian), corroborate the age of the fossil-bearing rocks. These are the first records of Orbiculoidea caneyana and O. capuliformis in Mexico and, along with O. missouriensis , highlight the paleobiogeographic relationship of the carboniferous faunas of Nochixtlán with coeval faunas described in the east-central region of the United States.

Keywords: Brachiopods, Orbiculoidea , Carboniferous, Chesterian, Morrowan-Desmoinesian, Mexico.


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