Pg. 6, 19, pls. 2, 3, 4. Coalfield sandstone of Crooked Fork group. Includes both massive and thin phases. Thickness 30 to 60 feet; in Crooked Fork section 42 feet; west of Oneida and in southeast part of Barthell Southwest quadrangle thins to 10 or 15 feet. In Morgan County, sandstone locally splits into two or three benches. Underlies Glenmary shale (new); overlies Burnt Mill shale (new). Age is Early Pennsylvanian (Pottsville).
Underlies town of Coalfield, Petros quadrangle, Morgan Co., eastern TN.

Source: US geologic names lexicon (USGS Bull. 1200, p. 855-856).

(East-central sheet; not separately mapped.) Coalfield Sandstone of Crooked Fork Group. Gray to brown, fine- to medium-grained sandstone. Thickness 0 to 150 feet. Lies below Glenmary Shale and above Burnt Mill Shale; both of Crooked Fork Group. Age is Pennsylvanian.

Source: Publication.

Coalfield Sandstone of Crooked Fork Group mapped in Roane and Morgan Cos., eastern TN. Unit consists of light-gray to medium light- and olive-gray, very fine to medium-grained thin- to medium-bedded, silty sandstone. Commonly interbedded with olive-gray to olive-black shale and sandy siltstone laminae and beds. Typically poorly cemented. Thickness 30 to 60 ft. Overlies Burnt Mill Shale and underlies Glenmary Shale, both of Crooked Fork. Age is Early Pennsylvanian.

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