WOODWARD, Okla. (AP) — Oil production continues to expand throughout Oklahoma, including in areas outside the state's two core fields.

The STACK and SCOOP fields are dominated by larger, independent oil companies that include Continental Resources Inc., Devon Energy Corp. and Newfield Exploration, the Oklahoman reported.

But smaller, private companies reported strong results in other parts of the state, such as the Merge between STACK and SCOOP, the Anadarko Basin in western Oklahoma, and the Arkoma Stack in southeast Oklahoma.

"Oklahoma is unique in how many stack interval plays are available...