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| | Summary of Citation |
 | | Is lower member of two in the Upper Cretaceous Boquillas Formation as mapped in Presidio and Brewster Cos, TX in southern part of Permian basin. |
 | | Consists of limestone, siltstone, and clay; limestone, silty ranging to siltstone, flaggy, beds mostly 2 to 5 in thick, some as thick as 18 in; clay, mostly as partings; bluish gray, weathers light yellowish gray to light brownish yellow, blocky from joints; marine megafossils and microfossils common. |
 | | Is lower member of two in Boquillas Formation as mapped south of Del Norte Mountains in Brewster Co, TX (southern part of Permian basin). |
| ngmdb.usgs.gov /Geolex/Refsmry/sumry_7649.html (481 words) |
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