Historical:Litchfield Coal Member
Lithostratigraphy: Kewanee Group >>Spoon Formation >>Litchfield Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Desmoinesian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Litchfield Coal Member of the Spoon Formation (Kay, 1915, table 9 and footnote, p. 139) is named for Litchfield, Montgomery County, where the coal was mined at a depth of 684 feet in the Litchfield Collieries Company Mine No. 7.
Type Section
The type section is at the Litchfield Collieries Company Mine No. 7 (SE NE NE 32, 9N-5W).
Correlation
The Litchfield Coal is probably equivalent to the lower bench of the Assumption Coal and to the Rock Island (No. 1) Coal.
Extent and Thickness
In the mine, the Litchfield Coal occurs about 150 feet below the Lowell Coal and is 2-7 feet thick. It is not widely recognized throughout southern Illinois but has been found in a few drill holes.
References
KAY, F. H., 1915, Coal resources of District VII (Coal No. 6 west of Duquoin anticline): Illinois State Geological Survey Mining Investigations 11, 233 p.
ISGS Codes
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