Pg. 142, 143 (table), 144-145; 1947, Jour. Geol., v. 55, no. 3, pt. 2, p. 196 (table 2), 197 (fig. 2), 198. Brook Ranch member of Big Saline formation. Present in central Texas. Typically very hard subcrystalline dark-gray, nearly black cherty limestone. Total thickness 15 to 25 feet. Overlies Gibbons conglomerate member, west side of Cavern Ridge; underlies Lemons Bluff member. Age is Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 492).

Pg. 64. Brook Ranch lentil and Brook Ranch member of Big Saline formation. Brook Ranch lentil makes up basal layers of Big Saline in Kimble, Mason, and McCulloch Counties, central Texas. Occurs between Gibbons conglomerate lentil and Lemons Bluff member, where it is present, and otherwise between Gibbons conglomerate or older rocks and Soldiers Hole limestone beds. Brook Ranch member extends from mouth of Big Saline Creek in Kimble County to Little Brady Creek south of Rochelle in McCulloch County where it pinches out against Ellenburger uplift. Thickness at designated type locality 22 to 25 feet. Age is Pennsylvanian.
Type locality: along abandoned highway, 3.5 mi south and 1 mi east of Brady, and 0.75 mi northwest of Brook Ranch headquarters, McCulloch Co., central TX.

Source: US geologic names lexicon (USGS Bull. 1200, p. 492).