Kidd Member

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Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Salem Limestone >>Kidd Member
Chronostratigraphy: Paleozoic Erathem >>Mississippian Subsystem >>Valmeyeran Series
Allostratigraphy: Kaskaskia 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)

Elwood Atherton, Charles Collinson, and Jerry A. Lineback


Original description

The Kidd Member of the Salem Limestone (Baxter, 1960a, p. 19-22; Lineback, 1972, p. 5).


Named for Kidd, Monroe County.

Other names


As originally defined, it included the Harrodsburg Member of the Ullin Limestone, but it was restricted by Lineback to the biocalcarenite below the Fults Member and above the Ullin.

Type section

Type location

The type section of the Kidd Member is in the Mississippi River bluffs east of the village of Kidd, Monroe County (NE NE 1, 5S-10W).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

The Kidd Member is the basal member of the Salem Limestone.

Extent and thickness

In the type section the Kidd consists of about 22 feet of chert-free, high-calcium biocalcarenite, largely made up of medium and coarse grains of fragmented fossils, mostly crinoid columnals and bryozoan detritus, in beds 2-3 feet thick.





Well log characteristics


The foraminifers Endothyra sp., Tournayella sp., and Globoendothyra sp. are present. Globoendothyra baileyi is common and becomes more common in the upper half of the member.

Age and correlation

Environments of deposition

Economic importance



BAXTER, J. W., 1960a, Salem Limestone in southwestern Illinois: Illinois State Geological Survey Circular 284, 32p.
LINEBACK, J. A., 1972, Lateral gradation of the Salem and St. Louis Limestones (Middle Mississippian) in Illinois: Illinois State Geological Survey Circular 474, 23 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation