DAWSON GEOPHYSICAL CO — Director's Dealing 2009

Dec 8, 2009

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2009-12-04

Reporting Person: BARRETT WILLIAM J (Director, 10% Owner)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2009-12-04	Nonqualified Stock Option	$4.07	A	18987	Acquired	2014-12-03	Common Stock (18987)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1706356	Direct
Common Stock	153343	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (reload)	$6.12	2010-10-10	Common Stock (1695)	1695	Direct
Nonqualified Stock Option	$8.78	2012-09-18	Common Stock (10466)	10466	Direct
Nonqualified Stock Option	$3.24	2013-10-22	Common Stock (23162)	23162	Direct

Footnotes

F1: The Reporting Person disclaims beneficial ownership of common stock owned by spouse.

F2: Not applicable.

F3: Adjusted for the Companys 5% stock dividend paid to all holders of record of common stock on May 12, 2009.

F4: Currently exercisable.

F5: The option vests in two equal installments beginning on 12-04-2009.