Wayside Sandstone Member
M. E. Hopkins and J. A. Simon
The Wayside Sandstone Member of the Caseyville Formation is named for Wayside, Johnson County (Lamar, 1925, p. 84-85).
The type section consists of outcrops near the village (N1/2 30, 11S-2E) (Wanless, 1956, p. 9).
The Wayside is equivalent, at least in part, to the Lusk Shale to the east.
The Wayside is the lowermost unit of the Pennsylvanian System on the western side of the southern Illinois outcrop belt.
Like the Lusk, the Wayside is a complex unit of interbedded lenticular sandstones as much as 50 feet thick that are separated by silty or sandy shales and siltstones, all part of a fluvial-deltaic complex. In the area south of Carbondale the thickness of the Wayside varies but averages about 70 feet.
LAMAR, J. E., 1925, Geology and mineral resources of the Carbondale Quadrangle: Illinois State Geological Survey Bulletin 48, 172 p.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
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