Pg. 37, 49 (table 1), pl. 1. Pond Creek coal member of Modesto formation. Proposed for coal member reported at depth of 125 feet in drillhole. Occurs above DeGraff coal member (new) and below Lake Creek coal member (new). Coal has been referred to informally as 2nd Cutler Rider coal. Piasa limestone and DeGraff, Pond Creek, and Lake Creek coals may be included in the complex West Franklin limestone member in eastern part of area. Age is Pennsylvanian. Presentation of new rock-stratigraphic classification of Pennsylvanian of Illinois. Cyclical classification is retained but is entirely independent of rock-stratigraphic classification.
Type locality (subsurface): Consolidated Coal Company drillhole 91, in SW/4 SW/4 NE/4 NE/4 sec. 21, T. 8 S., R. 3 E., West Frankfort 15-min quadrangle, Williamson Co., southeastern IL. Named from Pond Creek which flows through northern part of twp.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3090).