Historical:Trowbridge Coal Member

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Handbook of Illinois Stratigraphy
Series Bulletin 95
Author H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date 1975
Link Web page
PDF PDF file
Store ISGS Store

Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Trowbridge Coal Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Virgilian Series
Allostratigraphy: Absaroka Sequence


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.


The Trowbridge is a normally banded coal that is high in ash.


CADY, G. H., 1948, Analyses of Illinois coals: Illinois State Geological Survey Supplement Bulletin 62, 77 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation