A wealth of information on the formations and great links at the site;

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Marcellus and Utica Shales Data

Resource estimates indicate the Devonian-age Marcellus Shale is the largest exploration play in the eastern United States.  Recently, the application of horizontal drilling combined with multistaged hydraulic fracturing to create permeable flow paths from wellbores into shale units has resulted in a drilling boom for the Marcellus in the Appalachian Basin states of Pennsylvania, West Virginia, southern New York, and eastern Ohio. This proven technology also may have application in other shale units, such as the Ordovician-age Utica Shale, which extends across much of the Appalachian Basin region. While limited production has occurred in the Utica up to this point, thickness and widespread geographical extent indicate it may also have great oil-and-gas potential.

In response to increased demand for data on these shales, the ODNR Division of Geological Survey has compiled a series of documents and data sets for both rock units. Published diagrams, isopach (thickness) maps, cross sections, and location maps for Marcellus and Utica producing wells are among the numerous documents and links provided on this page, which is updated periodically as new information and data becomes available.

For an introduction to these two plays and their potentials for producing oil and gas in Ohio, see PDF slide show below.

http://www.dnr.state.oh.us/geosurvey/tabid/23014/Default.aspx