DAWSON GEOPHYSICAL CO — Director's Dealing 2006

Apr 27, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2006-04-25

Reporting Person: Winn Daniel G (Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-04-25	Common Stock	J	505	—	Acquired	10605	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2006-04-25	Stock Option	$.76	J	400	Acquired	2009-02-19	Common Stock (8000)	Direct
2006-04-25	Stock Option	$5.06	J	250	Acquired	2010-06-06	Common Stock (5000)	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.

F2: Adjusted for Company's 5% stock dividend paid on April 25, 2006.

F3: Not applicable.