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: WHITENER WAYNE A (Director, President and CEO)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2008-10-24	Stock Option	$3.37	A	50000	Acquired	2013-10-23	Common Stock (50000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	86555	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option	$4.60	2010-06-06	Common Stock (57881)	57881	Direct

Footnotes

F1: Adjusted for the Company's 5% stock dividends paid to all holders of record of common stock on April 27, 2007 and April 28, 2008.

F2: Currently exercisable.

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

F4: Not applicable.