Part two of our journey west to visit the Barnett Shale and see first hand what the boom offers: insight into Haynesville Shale economic potential. FORT WORTH, TX (KSLA) - The potentially prolific Haynesville Shale is already drawing comparisons to the Barnett Shale, which lies about 8000 feet below the surface of a 6000 square mile area that covers 20 counties in North Texas, including Tarrant, Johnson and Wise. It's not yet known exactly how much area the Haynesville Shale covers, but it's ...