Pg. 929, 939-940. Apache limestone. In Apache Mountains, in southeastern Culberson County, western Texas, there is exposed a limestone series about 1,000 feet thick, which resembles Capitan limestone to a marked degree. The local name Apache limestone has been applied to it. It consists of massive gray and white limestones, exhibiting practically the same lithological characteristics and fauna as the Capitan and an overlying, well-bedded pisolitic series resembling the Carlsbad limestone. No fossils found by writer, but Girty reports a few forms of Guadalupian age. It is almost certainly = Capitan and the Carlsbad limestones. The Apache limestone seems to be a barrier reef with accompanying lagoonal deposits.

Source: US geologic names lexicon (USGS Bull. 896, p. 60).