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The correlation of stratigraphic intervals between drill holes was based on a variety of geophysical (wireline) and lithologic logs. The most commonly used geophysical logs were the gamma-ray-neutron and gamma-ray-density log suites, and the most commonly used lithologic logs were those produced by the Geological Sample Log Company (table 1; Appendix B). Gamma-ray logs used for correlations were digitized as Log ASCII files (LAS), converted to graphic images, and then plotted next to their respective drill holes (Crangle, 2007). The lithology assigned to each stratigraphic interval was simplified to just a few rock types and lithologic modifiers. The topographic profile for the cross section was created from a Shuttle Radar Topography Mission (SRTM) 90-meter (m)grid digital elevation model (DEM) for parts of Ohio,