Dawson Geophysical (DWSN) 10-Q 2008 Q2 Quarterly report

EXHIBIT 32.1

Certification of

Chief Executive Officer

of TGC Industries, Inc. Pursuant to

18 U.S.C. Section 1350, as adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

This certification is furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and accompanies the quarterly report on Form 10-Q (the “Form 10-Q”) for the quarter ended June 30, 2008 of TGC Industries, Inc. (the “Company”).  I, Wayne A. Whitener, the Chief Executive Officer of the Company, certify that, to the best of my knowledge:

(1)The Form 10-Q fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934; and

(2)The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of, and for, the periods presented in the Form 10-Q.

Dated:  August 8, 2008

/s/ Wayne A. Whitener

Wayne A. Whitener

President and Chief Executive Officer

The foregoing certification is being furnished as an exhibit to the Form 10-Q pursuant to Item 601(b)(32) of Regulation S-K and Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and accordingly, is not being filed as part of the Form 10-Q for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.