------------------------------ OMB APPROVAL ------------------------------ OMB Number 3235-0101 Expires: August 31, 2003 Estimated average burden hours per response 2.0 ------------------------------ ------------------------------ SEC USE ONLY ------------------------------ DOCUMENT SEQUENCE NO. ------------------------------ CUSIP NUMBER ------------------------------ WORK LOCATION ------------------------------ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933 ATTENTION: Transmit for filing 3 copies of this form concurrently with either placing an order with a broker to execute sale or executing a sale directly with a market maker. ================================================================================ 1 (a) NAME OF ISSUER (Please type or print) Dawson Geophysical ----------------------------------------------------------------------------- 1 (b) IRS IDENT. NO. 75-0970548 ----------------------------------------------------------------------------- 1 (c) S.E.C. FILE NO. 2-71058 ----------------------------------------------------------------------------- 1 (d) ADDRESS OF ISSUER 508 W. Wall, Suite 800 Midland Texas 79701 ----------------------------------------------------------------------------- Street City State Zip Code ----------------------------------------------------------------------------- 1 (e) TELEPHONE NO. (432) 684-3000 ----------------------------------------------------------------------------- Area Code Number ================================================================================ 2 (a) NAME OF PERSON FOR WHOSE ACCOUNT THE SECURITIES ARE TO BE SOLD C. Ray Tobias ----------------------------------------------------------------------------- 2 (b) IRS IDENT. NO. 455-84-6480 ----------------------------------------------------------------------------- 2 (c) RELATIONSHIP TO ISSUER Employee ----------------------------------------------------------------------------- 2 (d) ADDRESS 2805 Arrowhead Midland Texas 79705 ----------------------------------------------------------------------------- Street City State Zip Code ================================================================================ INSTRUCTION: The person filing this notice should contact the issuer to obtain the IRS Identification Number and the S.E.C. File Number. ==================================================================================================================================== (b) Name and Address of Each Broker (c) Number (e) Number 3(a) Through Whom the of Shares of Shares Title Securities Are To or Other or Other (f) Approximate (g) Name of Each of the Be Offered or SEC USE ONLY Units To (d) Aggregate Units Date of Sale Securities Class of Each Market Maker Be Sold Market Value Outstanding (See Instr. Exchange Securities Who Is Acquiring Broker-Dealer (See instr (See instr. (See instr. 3(f)) (See Instr. To Be Sold the Securities File Number 3(c)) 3(d)) 3(e)) (MO./DAY/YR.) 3(g)) ---------------------------------------------------------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------------------------------------- Common Dain Rauscher 2,000 4/14/03 60 South Sixth Street Minneapolis, MN 55402-4422 ==================================================================================================================================== INSTRUCTIONS: 1. (a) Name of Issuer. 3. (a) Title of the class of securities to be sold. (b) Issuer's I.R.S.Identification Number. (b) Name and address of each broker through whom the (c) Issuer's S.E.C. file number, if any. securities are intended to be sold. (d) Issuer's address, including zip code. (c) Number of shares or other units to be sold (if debt (e) Issuer's telephone number, including area code. securities, give the aggregate face amount). (d) Aggregate market value of the securities to be sold as 2. (a) Name of person for whose account the securities are of a specified date within 10 days prior to the filing to be sold. of this notice. (b) Such person's I.R.S. identification number, if (e) Number of shares or other units of the class outstanding, such person is an entity. or if debt securities, the face amount thereof outstanding, (c) Such person's relationship to the issuer (e.g., as shown by the most recent report or statement published officer, director, 10% stockholder, or member of by the issuer. immediate family of any of the foregoing). (f) Approximate date on which the securities are to be sold. (d) Such person's address, including zip code. (g) Name of each securities exchange, if any, on which the securities are intended to be sold. ==================================================================================================================================== TABLE I -- SECURITIES TO BE SOLD Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor: ==================================================================================================================================== Name of Person from Whom Acquired Nature of (If gift, also Amount of Title of Date You Acquisition give date donor Securities Date of the Class Acquired Transaction acquired) Acquired Payment Nature of Payment ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ Common 12/7/00 Grant Dawson Geophysical 2,000 ==================================================================================================================================== INSTRUCTIONS: If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments, describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid. ==================================================================================================================================== TABLE II -- SECURITIES SOLD DURING THE PAST 3 MONTHS Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold. ==================================================================================================================================== Amount of Name and Address of Seller Title of Securities Sold Date of Sale Securities Sold Gross Proceeds ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ ==================================================================================================================================== REMARKS: INSTRUCTIONS: ATTENTION: See the definition of "person" in paragraph (a) of Rule 144. The person for whose account the securities to which this notice Information is to be given not only as to the person for whose relates are to be sold hereby represents by signing this notice account the securities are to be sold but also as to all other that he does not know any material adverse information in regard persons included in that definition. In addition, information to the current and prospective operations of the Issuer of the shall be given as to sales by all persons whose sales are securities to be sold which has not been publicly disclosed. required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice. 4/4/03 /s/ C. Ray Tobias --------------------- -------------------------------- DATE OF NOTICE SIGNATURE The notice shall be signed by the person for whose account the securities are to be sold. At least one copy of the notice shall be manually signed. Any copies not manually signed shall bear typed or printed signatures. ================================================================================ ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (see 18 U.S.C. ss. 1001). ================================================================================