Historical:Trowbridge Coal Member
Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Trowbridge Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Virgilian Series
Allostratigraphy: Absaroka Sequence
Authors
M. E. Hopkins and J. A. Simon
Name Origin
The Trowbridge Coal Member of the Mattoon Formation (Cady, 1948, p. 5, footnote 4) is named for Trowbridge, Shelby County.
Type Section
The type locality consists of outcrops about 1 mile northeast of the town (S line 11, 10N-6E).
Extent and Thickness
The Trowbridge attains a maximum thickness of 2.5-3 feet. It has not been traced far from the type area.
Stratigraphic Position
It occurs about 150-180 feet above the Omega Limestone.
Description
The Trowbridge is a normally banded coal that is high in ash.
References
CADY, G. H., 1948, Analyses of Illinois coals: Illinois State Geological Survey Supplement Bulletin 62, 77 p.
ISGS Codes
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