Dix Limestone Member

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Lithostratigraphy: McLeansboro Group >>Mattoon Formation >>Dix Limestone Member
Chronostratigraphy: Paleozoic Erathem >>Pennsylvanian Subsystem >>Missourian 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


Original description

The Dix Limestone Member of the Mattoon Formation (Bradbury, 1965, p. 4).


Named for Dix, Jefferson County, where it has been quarried locally.

Other names


Type section

Type location

The type section consists of exposures on a southwest-flowing tributary to Casey Fork, about 2 miles south of Dix (NW SE NW 25, 1S-2E).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

It lies about 50 feet above the position of the Millersville Limestone and 300 feet above the Shoal Creek Limestone.

Extent and thickness


In the area of the type section, the Dix is a brownish gray argillaceous limestone as much as 6 feet thick that contains only Spirorbis and numerous ostracodes.




Well log characteristics


Age and correlation

The Dix may correlate with the fresh-water limestone found at the base of the underclay below the Opdyke Coal.

Environments of deposition

Economic importance



BRADBURY, J. C., 1965, Limestone resources of Jefferson and Marion Counties, Illinois: Illinois State Geological Survey Industrial Minerals Note 23, 15 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation