The Harrodsburg Limestone is a geologic formation, a member of the Sanders Group of Indiana Limestone, of Mississippian age.
It was named for Harrodsburg in southern Monroe County, Indiana by T. C. Hopkins and C. E. Siebenthal ("The Bedford Oolitic Limestone of Indiana" - 1897).
Harrodsburg Limestone is found throughout the part of the Illinois Basin running through southern Indiana.
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