The presence of hydrocarbon source rocks in Cambrian sub-Knox Group sedimentary rocks of the Appalachian Basin has been debated for years. Numerous shows of oil and gas in sub-Knox Group rocks have suggested that mature source rocks exist, but the lack of commercial production left doubt as to whether source rocks were rich enough to have formed significant accumulations. Limited production in the 1970?s and 1980?s, and more significant commercial production from the Homer Field in Elliott County, Ky. And a nearby well in Lawrence County, Ky. in the 1990?s indicate that economic Cambrian reservoirs are present in the Appalachian Basin, outside of Ontario, Canada. Data available for the Homer Field from 1997 through 2000 indicate a minimum of 1.8 BCF of gas has been produced (this number does not include data for the first 3 years of production).