Historical:Gimlet Sandstone Member
M. E. Hopkins and J. A. Simon
The Gimlet Sandstone Member of the Modesto Formation (Wanless, 1931a, p. 182, 183, 190, 192) is named for Gimlet Creek in Marshall County.
The type section consists of exposures along Gimlet Creek (N 1/2 SE 16, 12N-9E) (Wanless, 1956, p. 11; 1957, p. 116).
Extent and Thickness
The Gimlet Sandstone is locally developed as a fine- to medium-grained channel sandstone 50-60 feet thick, which cuts down from 50 feet above the Danville Coal to within a few feet of the Brereton Limestone. In other places the sandstone is only a few feet thick or is absent. The Gimlet Sandstone has been recognized principally in northern and western Illinois.
WANLESS, H. R., 1931a, Pennsylvanian cycles in western Illinois: Illinois State Geological Survey Bulletin 60, p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WANLESS, H. R., 1957, Geology and mineral resources of the Beardstown, Glasford, Havana, and Vermont Quadrangles: Illinois State Geological Survey Bulletin 82, 233 p.
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