GMX Resources Inc. operates as an independent oil and natural gas exploration and production company primarily in the United States. It has interests in two oil shale resources, including the Williston Basin that targets the Bakken/Sanish-Three Forks in North Dakota/Montana; and the Denver Julesburg Basin, which targets the Niobrara Formation in Wyoming. The company also holds interests in natural gas resources comprising the Haynesville/Bossier Formation in the East Texas Basin. GMX Resources Inc. was founded in 1998 and is headquartered in Oklahoma City, Oklahoma.