DAWSON GEOPHYSICAL CO — Director's Dealing 2004

Sep 16, 2004

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2004-09-15

Reporting Person: USELTON KENNETH W (Secretary and Treasurer)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5224	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$0.75	2004-10-19	Common Stock (4000)		Direct
Stock Option	$0.8	2009-02-19	Common Stock (6000)		Direct

Footnotes

F1: Stock options are exercisable as follows: one-third exercisable after twelve months from date of grant; two-thirds exercisable after twenty-four months from date of grant; and all exercisable after thirty-six months from date of grant.