DAWSON GEOPHYSICAL CO — Director's Dealing 2004

Oct 29, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2004-10-27

Reporting Person: HURTT WILLIAM C JR (Director, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-10-27	Common Stock	P	3000	$2.6	Acquired	403398	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	10800	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Warrants (Series A)	$0.2	2012-09-10	Common Stock (300000)	300000	Direct
Warrants (Series A2)	$0.2	2013-06-12	Common Stock (150000)	150000	Direct
8-1/2% Senior Convertible Preferred Stock	$		Common Stock (375000)	375000	Direct

Footnotes

F1: (1) The shares of the 8-1/2% Senior Convertible Preferred Stock are convertible into Common Stock on a one-for-one basis.

F2: (2) Immediately convertible.

F3: (3) Not applicable.