Pg. 136-138. Bear Spring formation. Name applied to fossiliferous and in part cherty limestones of early Middle Devonian [Eifelian] age that occur in an ancient collapse structure. Rocks are fine- to coarse-grained; color varies (white to cream colored, yellowish- or greenish-brown to buff, bronze, olive-brown. ivory, or nutria); over lower part of collapsed area, considerable dull-white to speckled-gray porcelaneous to semiporcelaneous chert occurs in float. At type locality, a patch of rocks, 240 feet long in northeast-southwest direction and 140 to 160 feet wide, has collapsed into limestones of Lower Ordovician Gorman formation and is in part overlapped by rocks of Mississippian age.
Type locality: [2.2 mi east of Bear Spring], near head of east fork of a draw that enters south side of valley of Honey Creek, about 280 ft upstream from rock cabin on Roy Zesch Ranch, Mason Co., central TX.

Source: US geologic names lexicon (USGS Bull. 1200, p. 253-254); supplemental information from GNU records (USGS DDS-6; Denver GNULEX).