Trowbridge Coal Member
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
M. E. Hopkins and J. A. Simon
The Trowbridge Coal Member of the Mattoon Formation (Cady, 1948, p. 5, footnote 4).
Named for Trowbridge, Shelby County.
The type locality consists of outcrops about 1 mile northeast of the town (S line 11, 10N-6E).
It occurs about 150-180 feet above the Omega Limestone.
Extent and thickness
The Trowbridge attains a maximum thickness of 2.5-3 feet. It has not been traced far from the type area.
The Trowbridge is a normally banded coal that is high in ash.
Well log characteristics
Age and correlation
Environments of deposition
CADY, G. H., 1948, Analyses of Illinois coals: Illinois State Geological Survey Supplement Bulletin 62, 77 p.
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