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An Upper Pliocene Equisetum (Equisetales) from the Atotonilco El Grande Formation in Central Mexico
Authors:A. Silva-Pineda  M. P. Velasco-de Leon  F. J. Aguilar  E. Chacon
Affiliation:(1) Instituto de Geología, UNAM, Ciudad Universitaria, Coyoacán, 04510 México, D. F., México;(2) Facultad de Estudios Superiores Zaragoza, UNAM, Batallón 5 de mayo s/n, Col. Ejército de Oriente, Iztapalapa, 09230 México, D.F., México;(3) Centro INAH, Coahuila, Nicolás Bravo Norte 120, Zona Centro, 25000 Saltillo, Coahuila, Mexico;(4) Facultad de Ciencias de la Tierra, UANL, Carretera Cerro Prieto Km 8, Exhacienda de Guadalupe, Linares, Nuevo León, Mexico
Abstract:The present work documents the occurrence of Equisetum in the Upper Pliocene deposits of Central Mexico, describing and comparing fossil taxa with modern specimens. All taxonomic characters suggest a close affinity to the modern species Equisetum myriochaetum Schldl. et Cham. This work, which records the first Upper Pliocene occurrence of Equisetum in Central Mexico, confirms the wide distribution of the genus in high latitudes and more humid climates.
Keywords:Equisetum   impressions  fossil leaves  Central Mexico  Late Pliocene
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