Alta Mesa Resources, Inc., formerly Silver Run Acquisition Corporation II, is an oil and gas exploration company. The Company is focused on the development and acquisition of unconventional oil and gas reserves in Oklahoma. Its exploration operations are located in the eastern portion of the Anadarko basin, and are referred to as Sooner Trend Anadarko Basin Canadian and Kingfisher County (STACK). The STACK represents the Companyâ€™s exploration locations, the Alta Mesa acreage and the Kingfisher Midstream plant. It is a prolific hydrocarbon system with high oil and liquids-rich natural gas content and has multiple horizontal target horizons.