Unnamed nonmarine, partly tuffaceous strata near Ixtapa, Chiapas, Mexico, contain fresh-water mollusks, land mammals, well-preserved leaves and charophytes. The vertebrates indicate a probable late Miocene age for the section, part of which is of lacustrine origin. The charophytes Charetes strobilicarpa var. ellipsoidea (Reid and Groves) Daily, Croftiella ovalis subsp. mexicana Daily n. subsp. and Tectochara ixtapensis Daily n. sp. are described.

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