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This is a structure contour map representing the top of several lower Cambrian sandstone units. It was created by computer interpolation (kriging) of borehole data for much of the map extent. In KY, the extensive faulting required that the data be interpolated by hand. Hand interpolation/ extrapolation was also conducted in W and SW PA, based on previous maps by Wagner (1975). The map represents the tops for the Mt Simon formation in MI and IN. In central Ohio, there is an East- West transition from Mt Simon to a stratigraphically higher, more arkosic sand unit within the Conasauga Formation. In KY, these units transition to the basal sand units of the Rome Trough. In NW Pa, the tops represent the Potsdam formation. More detailed mapping of these units is planned for phase II of the project.<\/SPAN><\/P>

Author/Originator: The Geological Surveys of Ohio, Kentucky, Maryland, Michigan, Pennsylvania and West Virginia<\/SPAN><\/P>

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