Earthstone Energy, Inc. engages in the exploration, development, and production of crude oil and natural gas properties in the United States. It primarily operates in the North Dakota and Montana portions of the Williston basin, and south Texas. As of March 31, 2013, it had an estimated net proved oil and natural gas reserves of 2,457,000 barrels of oil and condensate, as well as 2,786,000 thousand cubic feet of natural gas; and owned a working interest in 138 gross producing oil wells, 3 gross producing gas wells, 7 disposal wells, and 7 injector wells in the states of North Dakota, Montana, Texas, Louisiana, Colorado, and Wyoming. The company was formerly known as Basic Earth Science Systems, Inc. and changed its name to Earthstone Energy, Inc. in February 2010. Earthstone Energy, Inc. was founded in 1969 and is based in Denver, Colorado.