About 3,000 m of Permian strata near Las Delicias, southwestern Coahuila, Mexico, are divided into five informal units: Las Sardinas, El Tordillo, Palo Quemado, La Difunta, and La Colorada beds. The lithology and the ammonoid, brachiopod, and fusulinid biostratigraphy are described briefly. The age of the beds ranges from the Aktastinian through the Amarassian Stages (of Furnish). The major structural features are a large-scale synclinal fold and northeast-trending faulting. Major episodes in the geologic history are outlined.

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