Pg. 96, 97, 99, 100. Oran sandstone lentil of Brownwood shale member of Graford formation of Canyon group. A fairly continuous sandstone locally present in lower part of Brownwood shale in Palo Pinto County, Texas. [The town of Oran is in Palo Pinto County.] Consists of (descending): (1) light-brown massive thick-bedded sandstone, 3 feet thick, weathering to dark rusty-brown massive irregular blocks, in most places loosely cemented; (2) massive brown sandstone, 50 feet thick, loosely cemented in some portions, other portions very friable; slightly closer-grained than overlying bed. Rests on sandstone very similar to No. 2 of Oran lentil, but containing much more iron. Top of Oran sandstone lies 227 feet below top of Brownwood member in escarpment due west of Strawn oil field, central northern Texas. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 896, p. 1555).

Mapped [as an unranked unit] in Palo Pinto Formation of Canyon Group. Palo Pinto is mapped as the basal formation of Canyon Group in the southeastern part of the mapped area, north-central TX (ascending): Palo Pinto Formation, Wolf Mountain Shale, Winchell Limestone, Placid Shale, Ranger Limestone, Colony Creek Shale, and Home Creek Limestone. Farther east, Canyon is divided into (ascending): Willow Point Formation, Jasper Creek Formation and its Chico Ridge Limestone [unranked], Ventioner Formation, Ranger Limestone, and Colony Creek Shale. Only upper part of Palo Pinto crops out in map area. Oran consists of sandstone, tan and brown, fine to medium grained, ferruginous, locally cross-bedded, has channel-fill bodies in lower part, massive upward, forms rounded bench, fossil plant fragments common in lower part. Thickness as much as 30 ft. Age is Missouri (Late Pennsylvanian). Geologic map.

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