Devon Energy and Coterra Energy announced on Monday a definitive agreement to merge and create a premier shale operator in an all-stock transaction, implying a combined enterprise value of about $58 billion. The deal, announced today after weeks of speculation, would create a company with a significantly increased position in the premier part of the Permian Basin and operations in the Marcellus Shale and Anadarko Basin. The deal will create one of the top shale producers with pro-forma third quarter 2025 production exceeding 1.6 million…