Historical:Delwood Coal Member
M. E. Hopkins and J. A. Simon
The Delwood Coal Member of the Abbott Formation (Weller, 1940, p. 40) is named for Delwood, Pope County.
The type locality consists of exposures near the village of Delwood (NW NW 3, 11S-6E) (Wanless, 1956, p. 9).
The Delwood has been correlated with the Pope Creek Coal of western Illinois, the Upper Block Coal Member of Indiana, and the No. 3 (Ice House) coal of western Kentucky.
Extent and Thickness
The Delwood Coal has been identified in several widely scattered outcrops in southern Illinois and in places is more than 3 feet thick. It is probably not continuous and locally may have been removed by channeling during development of a younger sandstone. Very little is known of the distribution of the Delwood in subsurface north of the outcrop belt.
The name Delwood may have been applied to more than one coal and, in fact, recent palynological studies indicate the type Delwood may be equivalent to the Bidwell Coal Member of the lower part of the Spoon Formation.
WANLESS, H. R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956: Illinois State Geological Survey Circular 217, 14 p.
WELLER, J. M., 1940, Geology and oil possibilities of extreme southern Illinois: Illinois State Geological Survey Report of Investigations 71, 71 p.
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