Harrodsburg Limestone Member

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Lithostratigraphy: Mammoth Cave Limestone Megagroup >>Ullin Limestone >>Harrodsburg Limestone 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 Harrodsburg Limestone Member of the Ullin Limestone (Hopkins and Siebenthal, 1897, p. 296-297; Stockdale, 1939, p. 72-73; Smith, 1965, p. 11; Lineback, 1966, p. 33).


Named for Harrodsburg, Monroe County, Indiana.

Other names


In Monroe County the Harrodsburg strata were included in the Kidd Member of the Salem by Baxter (1960a), but they were excluded from the Kidd by Lineback (1972).

Type section

Type location

The original type section of the Harrodsburg Limestone Member was destroyed by highway construction, but an exposure 1 mile north of Harrodsburg is used as a standard reference section (Shaver et al., 1970).

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

Reference status

Stratigraphic relationships

Extent and thickness

The Harrodsburg Member is exposed along the Mississippi Valley in western and southwestern Illinois and in Hardin County in southeastern Illinois. It is over 800 feet thick in Hamilton County, but it thins northward and pinches out at the margin of the formation.


The Harrodsburg consists of light-colored bryozoan and crinoid debris.




Well log characteristics


Age and correlation

Environments of deposition

Economic importance



BAXTER, J. W., 1960a, Salem Limestone in southwestern Illinois: Illinois State Geological Survey Circular 284, 32p.
HOPKINS, T. C., and C. E. SIEBENTHAL, 1897, Bedford oolitic limestone of Indiana: Indiana Department of Geology and Natural Resources, Annual Report 21, p. 291-427.
LINEBACK, J. A., 1966, Deep-water sediments adjacent to the Borden Siltstone (Mississippian) delta in southern Illinois: Illinois State Geological Survey Circular 401, 48 p.
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.
SHAVER, R. H., et al., 1970, Compendium of rock-unit stratigraphy in Indiana: Indiana Geological Survey Bulletin 43, 229 p.
SMITH, N. M., 1965, Sanders Group and subjacent Muldraugh Formation (Mississippian) in Indiana: Indiana Geological Survey Report of Progress 29, 20 p.
STOCKDALE, P. B., 1939, Lower Mississippian rocks of the east-central interior: Geological Society of America Special Paper 22, 248 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation