Is Lower Cretaceous formation mapped Val Verde and Edwards Cos, TX (southeastern Permian basin), Kinney and Uvalde Cos, TX (Ouachita tectonic belt province), and Real Co, TX (Kerr basin). Overlies Glen Rose Limestone. Overlain by Del Rio Clay or Buda Limestone. Map unit described as limestone and dolomite; hard, miliolid, pellet, rudistid, shell fragment biosparite and lime mudstone; locally dolomitized, brecciated, and chert-bearing; rudistid mounds more common in upper part; nodular limestone in basal part; thickness about 700 ft. Is not mapped north of [what appears to be an arbitrary] east-west line that separates the unit from the Segovia and Fort Terrett Members of the Edwards Limestone. Is not mapped south of a similar east-west line that separates unit from the Salmon Peak Limestone, McKnight Formation, and West Nueces Formation. Is not mapped west beyond Val Verde Co, TX. In map explanation, is schematically depicted to be equivalent to Santa Elena Limestone, Sue Peaks Formation, and Del Carmen Limestone of western area; Salmon Peak Limestone, McKnight Formation, and West Nueces Formation of southern area; and Segovia and Fort Terrett Members of Edwards Limestone of northern area.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Devils River Limestone. Mapped in Medina and Uvalde Counties (Balcones fault zone), and northwestward into Bandera and Real Counties, Texas. Consists of limestone and dolomite; hard, miliolid, pellet, rudistid, shell fragment biosparite and lime mudstone; locally dolomitized, brecciated, and chert-bearing; rudist mounds more common in upper part; nodular limestone in basal part. Thickness about 700 feet. Correlative with Edwards Limestone; in part correlative with (ascending) West Nueces Formation, McKnight Formation, and Salmon Peak Limestone. Overlies Glen Rose Formation; underlies Del Rio Clay (Upper Cretaceous). Age is Early Cretaceous.

Source: Publication.