The Larrys Creek watershed has two deposits of low volatile bituminous coal along Roaring Run and a small, deep natural gas field. A potentially large source of natural gas is the Marcellus Shale, which lies below the surface here and stretches from New York through Pennsylvania to Ohio and West Virginia. Estimates of the total natural gas in the black shale from the Devonian era range from 168 to 516 trillion cubic feet (4.76 to 14.6 trillion m3), with at least 10 percent considered recoverable. In November 2007, drilling within the Larrys Creek watershed started in Mifflin Township, just west of Salladasburg, with a deep well. A second well was drilled in Mifflin Township in December 2007, and by February 2008 every well drilled in Lycoming County was producing natural gas. The Marcellus Shale requires special techniques to fracture the rock and release the gas, including pumping sand and water into the well, and, in some cases, horizontal drilling.