UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.1)*

TGC Industries, Inc.

(Name of Issuer)

Common Stock, $.01 par value

(Title of Class of Securities)

872417308

                                (CUSIP Number)                                

December 31, 2005

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Item 1	(a)	Name of Issuer: TGC Industries, Inc
Item 1	(b)	Address of Issuer’s Principal Executive Offices: 1304 Summit, Suite 2, Plano, TX 75074
Item 2	(a)	Name of Person Filing: Sidney Todres
Item 2	(b)	Address of Principal Business Office or, if none, Residence: 10 Vernon Road, Scarsdale, NY 10583
Item 2	(c)	Citizenship: Unites States of America
Item 2	(d)	Title of Class of Securities: Common Stock, $.01 par value
Item 2	(e)	CUSIP Number: 872417308
Item 3.	If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
	(a)	¨	Broker or dealer registered under Section 15 of the Exchange Act;
	(b)	¨	Bank as defined in Section 3(a)(6) of the Exchange Act;
	(c)	¨	Insurance company as defined in Section 3(a)(19) of the Exchange Act;
	(d)	¨	Investment company registered under Section 8 of the Investment Company Act;
	(e)	¨	An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);
	(f)	¨	An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);
	(g)	¨	A parent holding company or control person in accordance with Rule 13d- 1 (b) (1) (ii)(G)
	(h)	¨	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act;
	(i)	¨	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act;
	(j)	¨	Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

2

Item 4.	Ownership. Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
	(a)	Amount beneficially owned: 280,000 shares
	(b)	Percent of class: 1.9%
	(c)	Number of shares as to which the person has:
		(i)	Sole power to vote or to direct the vote: 280,000
		(ii)	Shared power to vote or to direct the vote: 0
		(iii)	Sole power to dispose or to direct the disposition of: 280,000
		(iv)	Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  x.
Item 6.	Ownership of More than Five Percent on Behalf of Another Person. Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company. Not Applicable
Item 8.	Identification and Classification of Members of the Group Not Applicable
Item 9.	Notice of Dissolution of Group Not Applicable
Item 10.	Certification By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

3

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

February 6, 2006

(Date)

/s/ Sidney Todres

(Signature)

Sidney Todres

(Name)

Attention:

Intentional misstatements or omissions of fact constitute Federal criminal violations (See 18 U.S.C. 1001)

4