Harwood Feffer LLP ( www.hfesq.com) is investigating potential claims against TGC Industries, Inc. ("TGC" or the "Company") (NASDAQ: TGE) concerning the Company’s agreement to be acquired by Dawson Geophysical Company (“Dawson”) (NASDAQ: DWSN) in a transaction valued at approximately $157 million. The transaction is expected to close by the late second quarter or early third quarter of 2011. On March 21, 2011, TGC announced that it had entered into a definitive merger agreement with Dawson. Under the terms of the deal, TGC’s shareholders will receive 0.188 shares of Dawson for every share they currently own of TGC, provided that the average of the volume weighted average price of Dawson common stock on the NASDAQ during the ten consecutive trading days ending on the second business day prior to the date of the shareholders’ meetings of Dawson and TGC to be called for the purpose of approving the transaction is equal to or greater than $32.54 but less than or equal to $52.54. In the event that the average of the volume weighted average price of Dawson’s common stock is outside of that range, then the parties, at their respective option, are entitled to terminate the transaction following good faith negotiations to determine a modified, mutually acceptable exchange ratio. Our investigation concerns whether there was a fair process to obtain fair consideration for the shareholders of TGC. If you own common shares of TGC and would like to learn more about these claims or if you wish to discuss this matter and have any questions or information concerning this announcement, please contact Robert I. Harwood, Esq. at firstname.lastname@example.org or James G. Flynn, Esq. at email@example.com. You may also call them at (877) 935-7400. For more information about class actions, or to sign up online, please visit our website: www.hfesq.com. Harwood Feffer LLP is a national shareholder litigation firm. Harwood Feffer LLP is devoted to protecting the interests of individual and institutional investors in shareholder actions in state and federal courts nationwide.