Folsomville Member


Petersburg Formation,

Pennsylvanian System

Type section and use of name: The name Folsomville was used by Eggert (1982, p. 7) for a clastic sequence of sediments as much as 65 feet (20 m) thick that splits the Springfield Coal Member into two or more beds in Gibson and Warrick Counties, Ind. These sediments were derived from the Leslie Cemetery Channel, a minor channel that was contemporaneous with part of the Springfield coal but that was abandoned before termination of peat deposition. Type and reference sections were designated in the SW¼NE¼ sec. 7, T. 5 S., R. 7 W., and in the NW¼SW¼ sec. 12, T. 5 S., R. 8 W., in Warrick County, but the type section was stated erroneously. It is in the SW¼SE¼ sec. 7. Where the upper split of the Springfield coal is absent, the uppermost bed of the Folsomville Member is the top of the Petersburg Formation.

Description: The Folsomville Member consists mostly of dark-gray to black organic shale (rash), tan and brown to gray shale, buff to gray sandstone, and some siltstone beds and vitrain bands. In some areas the Folsomville thickens gradually, but in others it thickens from a few tenths of feet to its maximum thickness within several hundred feet laterally.

Correlation: The Folsomville is equivalent to part of the Springfield Coal Member and may be similar in age to part of the Dykersburg Shale Member of Illinois.

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