Historical:Willis Coal Member
M. E. Hopkins and J. A. Simon
The Willis Coal Member of the Abbott Formation (Butts, 1925, p. 62-63) is named for the Willis Mine in Gallatin County (SE SW 30, 10S-9E).
It is correlated with the Tarter Coal of western Illinois and the Lower Block Coal Member of Indiana.
Extent and Thickness
The coal is present at widely scattered localities in the outcrop area in southern Illinois. It has been mined locally in southeastern Illinois, where it is 3-3.5 feet thick.
In the type area the Willis is closely underlain by the Grindstaff Sandstone Member and is immediately overlain by about 40 feet of Finnie Sandstone.
BUTTS, CHARLES, 1925, Geology and mineral resources of the Equality-Shawneetown area: Illinois State Geological Survey Bulletin 47, 76 p.
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