Pg. 374, 380. Big Valley bed in Strawn division. In descending order: (1) 150 feet of bluish and sandy or black and shaly clay; (2) 150 feet of sandstone, mostly massive but in part flaggy and a little shaly, commonly conglomeratic near top and calcareous in middle and upper part; and (3) 200 feet of clay, generally blue, with considerable blackish shale and a little sandstone. Is member of Strawn division [Strawn is 2nd from base of 5 Carboniferous divisions of Cummins, 1891]. Underlies Brown Creek bed and overlies Bull Creek sandstone. Age is Pennsylvanian.
[Named from Big Valley, Mills Co., Colorado River region, central TX.]

Source: Publication; US geologic names lexicon (USGS Bull. 896, p. 188).

Pg. 70. Big Valley bed in Strawn series. Consists of (descending): 150 feet of bluish and sandy or black and shaly clay; 150 feet of sandstone, mostly massive but in part flaggy and a little shaly; and 200 feet of clay, generally blue, with considerable blackish shale and a little sandstone. Underlies Brown Creek bed; overlies Bull Creek sandstone. [Age is Pennsylvanian; age of Strawn not discussed.]
[Report area in Parker County, central Texas.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 342); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).

Pg. 58, pl. 27. [†Big Valley bed of Strawn group not used by the USGS; a local term considered obsolete. See also entry under Strawn.] Drake (1893) separated rocks of Strawn group [division] into 20 units of alternating sandstone and shale beds. He gave local names to these units, or "beds" as he termed them, and numbered them from bottom to top, 4 to 23. Only Drake's name for upper unit, the Ricker, is in use today, and that name has been restricted to base of Drake's Ricker bed.

Source: US geologic names lexicon (USGS Bull. 1200, p. 342).