Spring Lake Coal Member
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
M. E. Hopkins and J. A. Simon
The Spring Lake Coal Member of the Carbondale Formation (Cady, 1948, p. 5; Peppers, 1970, p. 59).
Named for Spring Lake, La Salle County.
The type section consists of exposures on the east bank of the Vermilion River on the northwest side of Streator, about three-fourths of a mile northeast of the lake (SE SW SW 23, 31N-3E) (Willman and Payne, 1942, p. 130, 295; Peppers, 1970, p. 59).
It is separated from the overlying Herrin (No. 6) Coal by 11-17 feet of strata, the lower part of which consists of black fissile shale and gray shale. Estheria and Leaia are found in the gray shale. Spore analyses by Peppers (1970) suggest that its position is slightly above the Briar Hill Coal.
Extent and thickness
The coal was described from several outcrops and mines in a small area near Streator, where it has a maximum thickness of 2.5 feet (Willman and Payne, 1942, Unit 43).
Well log characteristics
Age and correlation
Environments of deposition
CADY, G. H., 1948, Analyses of Illinois coals: Illinois State Geological Survey Supplement Bulletin 62, 77 p.
PEPPERS, R. A., 1970, Correlation and palynology of coals in the Carbondale and Spoon Formations (Pennsylvanian) of the northeastern part of the Illinois Basin: Illinois State Geological Survey Bulletin 93, 173 p.
WILLMAN, H. B., and J. N. PAYNE, 1942, Geology and mineral resources of the Marseilles, Ottawa, and Streator Quadrangles: Illinois State Geological Survey Bulletin 66, 388 p.
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