Named for a ranch in western Palo Pinto Co, TX on Bend arch, where "typically exposed." No type locality designated. Also called Seaman Ranch beds; is lowermost of two [members] of Brad formation of Canyon group (both revised) in Brazos River Valley area. In Colorado River Valley area Brad formation consists of (ascending): Cedarton shale, Clear Creek limestone, Placid shale, and Ranger limestone [members]. In the Brazos River Valley (to north) Brad formation consists of (ascending): Seaman Ranch beds [or member], and Ranger limestone [member]. The Seaman Ranch beds are equivalent to Placid shale, Clear Creek limestone, and Cedarton shale [members] of Colorado River area. Seaman Ranch beds have an average thickness of 150-200 ft and consist of a basal bed of shale 60-100 ft thick overlain by 50-110 ft of dark-gray, soft, sandy shale containing one or two lentils of reddish-brown sandstone and a thin layer or two of dark-brown limestone. In most places the shales are nonfossiliferous, although one or two localities offer very fossiliferous beds. Is Pennsylvanian in age. Measured sections. Correlation chart.

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