Historical:Seville Limestone Member
M. E. Hopkins and J. A. Simon
The Seville Limestone Member of the Spoon Formation (Wanless, 1931a, p. 189, 192) is named for Seville, Fulton County.
The type locality is in the southwest bank of the Spoon River (SW SW 23, 6N-1E) (Wanless, 1956, p. 9; 1957, p. 72-73, 201).
The Seville Limestone is correlated with the Curlew Limestone Member of western Kentucky, the Lower Mercer Limestone of Ohio and Pennsylvania, and the Verne Shaly Limestone Member of Michigan (Wanless, 1957, p. 73). The name "Seville" has also been applied to this limestone in Missouri and Oklahoma.
Extent and Thickness
The Seville is sporadic in occurrence and varies in thickness. It is seldom more than 4 feet thick, but more than 30 feet has been reported near Cuba, Fulton County. In several quarries in Rock Island and Mercer Counties, thicknesses up to 16 feet occur. The thicker occurrences are in narrow belts believed to have been estuaries, and in those areas the underlying Rock Island (No. 1) Coal is also thicker than elsewhere.
The Seville Limestone is dark gray and argillaceous, and it contains a well preserved and diverse marine fauna.
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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