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Source Rock Maturity Immature (%R o values < 0.6) Oil window (%R o values 0.6 to 1.3) Gas window (%R o values 1.3 to 2.0) Overmature (%R o values > 2.0) Outline of basin Outline of maximum extent of Devonian shale-Dashed where concealed Sample with %R o value Sample with conodont CAI value Sample with SCI value 0 50 100 150 200 250 miles 0 50 100 150 200 250 300 350 kilometers Michigan basin Illinois basin Appalachian basin Conodont Color Alteration Index (CAI) Liptinite Fluorescence Thermal Alteration Index (TAI) Hydrocarbon Generation / Preservation Events Vitrinite Reflectance in %R o (mean)

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