DAWSON GEOPHYSICAL CO — Director's Dealing 2006

Apr 27, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2006-03-06

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-03-06	Common Stock	G	18200	—	Disposed	1435676	Direct
2006-04-25	Common Stock	J	71783	—	Acquired	1507459	Direct
2006-04-25	Common Stock	J	6436	—	Acquired	135167	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2006-04-25	Warrants (Series C2)	$.95	J	260	Acquired	2007-12-15	Common Stock (5460)	Indirect
2006-04-25	Stock Option (reload)	$6.81	J	70	Acquired	2010-10-10	Common Stock (1465)	Direct

Footnotes

F1: The Reporting Person disclaims beneficial ownership of shares and warrants owned by spouse.

F2: Not applicable.

F3: Gifts to members of Reporting Person's family (not living in same household).

F4: Adjusted for Company's 5% stock dividend paid on April 25, 2006.