DAWSON GEOPHYSICAL CO — Director's Dealing 2010

Feb 10, 2010

SEC Form 5 — Annual Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2009-12-31

Reporting Person: GARDNER HERBERT M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2009-12-10	Common Stock	G	1450	—	Disposed	590475	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	69503	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Nonqualified Stock Option	$5.90	2010-10-10	Common Stock (1695)	1695	Direct
Nonqualified Stock Option	$8.80	2012-09-18	Common Stock (10466)	10466	Direct
Nonqualified Stock Option	$3.25	2013-10-22	Common Stock (23162)	23162	Direct
Nonqualified Stock Option	$4.07	2014-12-03	Common Stock (18987)	18987	Direct

Footnotes

F1: Not applicable

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

F3: Includes 255,987 shares held in Reporting Persons IRA accounts.

F4: Currently exercisable.

F5: Option vests in two equal installments beginning on December 4, 2009.