Contango Oil & Gas Company (NYSE MKT: MCF) and Crimson Exploration Inc. (NasdaqGM: CXPO) jointly announced today that the registration statement on Form S-4 and related joint proxy statement regarding their proposed merger has been declared effective by the Securities and Exchange Commission (the “SEC”). Each company will hold a special meeting on Tuesday, October 1, 2013, to approve matters relating to the proposed merger between the two companies. Shareholders of record at the close of business on August 20, 2013 will be mailed the joint proxy statement in connection with the proposed merger and will be entitled to vote at the respective company’s special shareholder meeting. The joint proxy statement will be mailed to shareholders of both companies on or about August 26, 2013. The parties currently expect to complete the merger promptly following approval by the Crimson and Contango shareholders, subject to customary closing conditions. Contango shareholders are invited to attend its special meeting at 3700 Buffalo Speedway, Second Floor, Houston, Texas 77098 on October 1 at 9:30 a.m., local time. Crimson shareholders are invited to attend its special meeting at its offices at 717 Texas Avenue, Suite 2900, Houston, TX, 77002 on October 1 at 9:30 a.m., local time. About Contango Contango is a Houston-based, independent natural gas and oil company. Contango’s business is to explore, develop, produce and acquire natural gas and oil properties onshore and offshore in the shallow waters of the Gulf of Mexico. Additional information can be found on its web page at www.contango.com. About Crimson Crimson is a Houston, Texas based independent energy company engaged in the exploitation, exploration, development and acquisition of crude oil and natural gas, primarily in the onshore Gulf Coast regions of the United States. Additional information on Crimson is available on Crimson’s website at www.crimsonexploration.com. Forward-Looking Statements This press release contains forward-looking statements concerning the proposed transaction between Contango and Crimson, the expected timetable for completing the proposed transaction, its financial and business impact, management’s beliefs and objectives with respect thereto, and management’s current expectations for future operating and financial performance. Forward-looking statements are all statements other than statements of historical facts, which may be identified by words such as “believes,” “expects,” “anticipates,” “estimates,” “projects,” “intends,” “should,” “seeks,” “future,” “continue,” or the negatives of such terms, or other comparable terminology. In addition, forward-looking statements are subject to risks, uncertainties, assumptions and other factors that are difficult to predict and that could cause actual results to vary materially from those expressed in or indicated by them. Factors that could cause actual results to differ materially include, but are not limited to: (1) the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement, dated as of April 29, 2013 between Contango and Crimson (the “Merger Agreement”); (2) the outcome of any legal proceedings that may be instituted against Contango or Crimson and others following announcement of the Merger Agreement; (3) the inability to complete the merger transaction between Contango and Crimson (the “Merger”) due to the failure to satisfy the conditions to the Merger, including obtaining the affirmative vote of at least a majority of the votes cast by the holders of Contango’s outstanding shares of common stock entitled to vote on the approval of issuance of shares of Contango common stock and at least a majority of the votes cast by the holders of Crimson’s outstanding shares of common stock entitled to vote on the adoption of the merger agreement; (4) risks that the proposed transaction disrupts current plans and operations and potential difficulties in employee and customer retention as a result of the Merger; (5) the ability to recognize the benefits of the Merger; (6) legislative, regulatory and economic developments; and (7) other factors described in Contango’s and Crimson’s filings with the SEC. Many of the factors that will determine the outcome of the subject matter of this filing are beyond the ability of Contango or Crimson to control or predict. Neither Contango nor Crimson can give any assurance that the conditions to the Merger will be satisfied. Except as required by law, neither Contango nor Crimson undertakes any obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. Each of Contango and Crimson disclaims any responsibility for updating the information contained in this filing beyond the published date, or for changes made to this document by wire services or Internet service providers.