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The geological mapping of four 1:50,000 scale topographic maps (E14–4 A81 and E14–10 C11, C12, C22) published by the Instituto Nacional de Estadística y Geografía (INEGI), was carried out through several months of field–work. Geologic cartography was integrated with the interpretation of Landsat Thematic Mapper images and 1:75,000 scale aerial photos.