DAWSON GEOPHYSICAL CO — Director's Dealing 2008

Oct 27, 2008

SEC Form 4/A — Form 4/A

Issuer: TGC INDUSTRIES INC (TGE)
CIK: 0000799165
Period of Report: 2008-10-24

Reporting Person: Winn Daniel G (Vice President)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-10-24	Stock Option	$3.37	A	30000	Acquired	2013-10-23	Common Stock (30000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	28085	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$4.60	2010-06-06	Common Stock (5789)	5789	Direct

Footnotes

F1: Adjusted for the Company's 5% stock dividend paid on April 28, 2008.

F2: Currently exercisable.

F3: Stock options are exercisable as follows: one-third exercisable after 12 months from date of grant; two-thirds exercisable after 24 months from date of grant; and all exercisable after 36 months from date of grant.

F4: Not applicable.