DAWSON GEOPHYSICAL CO — Director's Dealing 2012

Aug 9, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2012-08-07

Reporting Person: GARDNER HERBERT M (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-07	Nonqualified Stock Option	$5.875	A	18750	Acquired	2017-08-06	Common Stock (18750)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	652725	Direct
Common Stock	76622	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Nonqualified Stock Option - reload	$9.92	2012-09-19	Common Stock (9279)	9279	Direct
Nonqualified Stock Option	$2.95	2013-10-22	Common Stock (25536)	25536	Direct
Nonqualified Stock Option	$3.69	2014-12-03	Common Stock (20933)	20933	Direct
Nonqualified Stock Option	$6.02	2016-11-20	Common Stock (17679)	17679	Direct

Footnotes

F1: Includes 282,220 shares held in Reporting Persons IRA accounts.

F2: Reporting Person disclaims beneficial ownership of shares owned by spouse.

F3: Currently exercisable.

F4: The option vests 50% on 11-21-2011 and 50% on 11-21-2012.

F5: Adjusted for the five percent stock dividend paid to all shareholders of record on May 14, 2012.

F6: The option vests 50% on 8-7-2012 and 50% on 8-7-2013.

F7: Not applicable.

F8: Reload option vests six months from date of grant.