This preliminary map is an interim geologic map product prepared to document progress accomplished during the second year of a multiyear project to map the bedrock geology of Morgan County, Indiana. The Martinsville quadrangle is located in the south-central portion of the county where the oldest rock units subcrop in paleovalleys filled with glacial outwash deposits. All the outcropping and subcropping rocks in the map area are assigned to the Lower Mississippian formations of the Borden Group---in ascending order, the informal lower and upper divisions of the Spickert Knob Formation and the Edwardsville Formation.
Rupp, R. F., McLaughlin, P. I., Bancroft, A. M., Hasenmueller, W. A., and Johnson, M. R., 2017, Preliminary map showing bedrock geology of the Martinsville 7.5-minute quadrangle, Indiana: Indiana Geological Survey Open-File Study 17-02, scale 1:24,000.
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