"The Permian section exposed at Apillapampa is divided into two formations: the Yaurichambi sandstone (92 feet) and the overlying Copacabana formation (850 feet). The Copacabana formation is itself divided into (1) a basal limestone member (574 feet) carrying abundant megafossils and fusulinids that permit a more concise age determination than was previously possible and (2) a coal member (276 feet) which also carriesfossil plants. Both members of the Copacabana formation are assigned a Wolfcampian-Leonardian age based on abundant fusulinid data."

GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States