DAWSON GEOPHYSICAL CO — Director's Dealing 2005

May 26, 2005

SEC Form 4/A — Form 4/A

Issuer: TGC INDUSTRIES INC (TGCI)
CIK: 0000799165
Period of Report: 2004-11-18

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-11-18	Common Stock	P	5000	$2.50	Acquired	393500	Direct
2004-11-19	Common Stock	P	500	$2.50	Acquired	394000	Direct
2004-11-22	Common Stock	P	1500	$2.51	Acquired	395500	Direct
2004-11-23	Common Stock	P	1000	$2.40	Acquired	396500	Direct
2004-11-24	Common Stock	P	14000	$2.40	Acquired	410500	Direct
2004-11-24	Common Stock	P	5000	$2.38	Acquired	415500	Direct

Footnotes

F1: Includes 15,700 shares of common stock held in Reporting Person's IRA.

F2: Adjusted to reflect the correct number of shares owned as reported on Form 5 filed with the SEC on February 8, 2005.

F3: These shares were reported as a single purchase of 30,000 shares for $2.40 per share on November 24, 2004, on the reporting person's original Form 4. The accurate number of shares purchased was a total of 27,000 shares acquired in six (6) separate transactions.