DAWSON GEOPHYSICAL CO — Director's Dealing 2011

Nov 23, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2011-11-21

Reporting Person: BARRETT WILLIAM J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-19	Common Stock	G	18500	—	Disposed	1746246	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-11-21	Nonqualified Stock Option	$6.32	A	16837	Acquired	2016-11-20	Common Stock (16837)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	161221	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Nonqualified Stock Option	$8.38	2012-09-18	Common Stock (10989)	10989	Direct
Nonqualified Stock Option	$3.09	2013-10-22	Common Stock (24320)	24320	Direct
Nonqualified Stock Option	$3.88	2014-12-03	Common Stock (19936)	19936	Direct

Footnotes

F1: Not applicable.

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

F3: Includes 1,696,159 shares of common stock held in Reporting Persons IRA accounts.

F4: Currently exercisable.

F5: The option vests 50% on 11-21-2011 and 50% on 11-21-2012.