Dix Limestone 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 Dix Limestone Member of the Mattoon Formation (Bradbury, 1965, p. 4).
Named for Dix, Jefferson County, where it has been quarried locally.
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).
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
BRADBURY, J. C., 1965, Limestone resources of Jefferson and Marion Counties, Illinois: Illinois State Geological Survey Industrial Minerals Note 23, 15 p.
|Stratigraphic Code||Geo Unit Designation|