DAWSON GEOPHYSICAL CO — Director's Dealing 2005

Feb 11, 2005

SEC Form 5 — Annual Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2004-12-31

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

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	766676	Direct
Common Stock	55231	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Warrants	$0.3	2009-07-31	Common Stock (200000)	200000	Direct
Warrants (Series A)	$0.2	2012-09-10	Common Stock (371000)	371000	Direct
Warrants (Series A2)	$0.2	2013-06-11	Common Stock (162329)	162329	Direct
Non-Statutory Stock Option	$1	2005-12-10	Common Stock (10000)	10000	Direct
8-1/2% Senior Convertible Preferred Stock	$		Common Stock (709200)	709200	Direct
8-1/2% Senior Convertible Preferred Stock	$		Common Stock (75500)	75500	Indirect
Warrants (Series C2)	$1	2007-12-15	Common Stock (5200)	5200	Indirect

Footnotes

F1: Reporting person disclaims beneficial ownership of shares owned by Spouse.

F2: Includes 71,000 additional shares of Common Stock issuable upon exercise, resulting from application of the Warrants anti-dilution provisions as a result of the PIK dividends paid on the Company's 8-1/2% Senior Convertible Preferred Stock.

F3: Includes 12,329 additional shares of Common Shares issuable upon exercise, resulting from application of the Warrants anti-dilution provisions as a result of the PIK dividends paid on the Company's 8-1/2% Senior Convertible Preferred Stock.

F4: The shares of the 8-1/2% Senior Convertible Preferred Stock are convertible into Common Stock on a one-for-one basis.

F5: Immediately convertible.

F6: Not applicable.