Historical:Lowell Coal Member
M. E. Hopkins and J. A. Simon
The Lowell Coal Member of the Carbondale Formation (Willman and Payne, 1942, p. 102-105) is named for Lowell, La Salle County, where the coal is 10 inches thick in the type section.
The type section of the Lowell Coal is an exposure on the Vermilion River (SE SW 8, 32N-2E).
It is equivalent to the Shawneetown Coal in southwestern, southern, and eastern Illinois.
Extent and Thickness
The Lowell Coal is present in northern Illinois and in the southern part of western Illinois.
It is a bright-banded, rather shaly coal underlain by a silty to sandy underclay and overlain by several feet of gray shale that contains two limestone beds, which are equivalent to upper units of the Oak Grove Limestone. The underclay overlies a siltstone containing plant root impressions, which in turn is underlain by gray shale containing additional limestone units equivalent to the Oak Grove Limestone.
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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