Pg. 207 (chart 1), 210-211. Rayville formation of Kickapoo Creek group (new). Proposed for beds from disconformity above Dennis Bridge limestone down to top of Parks formation. Includes approximately 1,000 feet of alternating limestone, blue and black shales, and sandstones. Outcropping members include Dennis Bridge limestone; an unnamed 100 to 125 foot section of shale, dolomitic limestones, and sandstone; Kickapoo [Falls] limestone; and Dickerson shale --a combined thickness of about 200 feet. Formation thins rapidly westward from type area, being less than 300 feet thick in Brown and Coleman Counties, north-central Texas. Age is Pennsylvanian (Lampassas). [Some reports place Kickapoo Creek group in Strawn Series.]
Type locality: southwestern Parker Co., north-central TX. Name derived from early settlement now almost abandoned, located 3.5 mi southeast of Dennis and a like distance southeast of Kickapoo Falls.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3209).