Contango, Crimson Announce Registration Statement on Form S-4 Regarding Proposed Merger Declared Effective by SEC

Contango Oil & Gas Company

and Crimson Exploration Inc.

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