Trowbridge Coal Member

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

Primary source

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.

Contributing author(s)

M. E. Hopkins and J. A. Simon

Name

Original description

The Trowbridge Coal Member of the Mattoon Formation (Cady, 1948, p. 5, footnote 4).

Derivation

Named for Trowbridge, Shelby County.

Other names

History/background

Type section

Type location

The type locality consists of outcrops about 1 mile northeast of the town (S line 11, 10N-6E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

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.

Lithology

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

Core(s)

Photograph(s)

Contacts

Well log characteristics

Fossils

Age and correlation

Environments of deposition

Economic importance

Remarks

References

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

ISGS Codes

Stratigraphic Code Geo Unit Designation
1670
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