-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, SN+t+xpglaDv2QAozIfW4oPJDO0UKBNvjFPKsHm5YIT8kznp7QHp4L/Mp71ZlAi2 0u7W9YVw5iivJ2u5FZYe+w== 0000354204-97-000316.txt : 19970222 0000354204-97-000316.hdr.sgml : 19970222 ACCESSION NUMBER: 0000354204-97-000316 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 19970212 SROS: NONE SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: DAWSON GEOPHYSICAL CO CENTRAL INDEX KEY: 0000351231 STANDARD INDUSTRIAL CLASSIFICATION: OIL AND GAS FIELD EXPLORATION SERVICES [1382] IRS NUMBER: 750970548 STATE OF INCORPORATION: TX FISCAL YEAR END: 0930 FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-39364 FILM NUMBER: 97525431 BUSINESS ADDRESS: STREET 1: 208 S MARIENFELD CITY: MIDLAND STATE: TX ZIP: 79701 BUSINESS PHONE: 9156827356 MAIL ADDRESS: STREET 1: 208 SOUTH MARIENFELD CITY: MIDLAND STATE: TX ZIP: 79701 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: DIMENSIONAL FUND ADVISORS INC CENTRAL INDEX KEY: 0000354204 STANDARD INDUSTRIAL CLASSIFICATION: UNKNOWN SIC - 0000 [0000] IRS NUMBER: 22370029 STATE OF INCORPORATION: IL FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 1299 OCEAN AVE STREET 2: 11TH FLOOR CITY: SANTA MONICA STATE: CA ZIP: 90401 BUSINESS PHONE: 3103958005 MAIL ADDRESS: STREET 1: 1299 OCEAN AVENUE STREET 2: 11TH FLOOR CITY: SANTA MONICA STATE: CA ZIP: 90401 SC 13G 1 SCHEDULE 13G - 2/96 - DAWSON GEOPHYSICAL C - ------------------------------------------------------------------- Page 1 of 4 SCHEDULE 13G (1996) Amendment No. 5 DAWSON GEOPHYSICAL C Cusip # 239359102 - -------------------------------------------------------------------- Page 2 of 4 Cusip # 239359102 Item 1: REPORTING PERSONS Dimensional Fund Advisors Inc. (Tax ID: 22-2370029) Item 4: CITIZENSHIP Delaware Corporation Item 5: SOLE VOTING POWER 148,300 * Persons who are officers of Dimensional Fund Advisors Inc. also serve as officers of DFA Investment Dimensions Group Inc., (the "Fund") and The DFA Investment Trust Company (the "Trust"), each an open-end management investment company registered under the Investment Company Act of 1940. In their capacities as officers of the Fund and the Trust, these persons vote 44,700 additional shares which are owned by the Fund and 29,100 shares which are owned by the Trust. (Included in Item 7 of this page of this Schedule) Item 6: SHARED VOTING POWER -- None Item 7: SOLE DISPOSITIVE POWER -- 222,100 Item 8: SHARED DISPOSITIVE POWER -- 0 Item 9: AGGREGATE AMOUNT BENEFICIALLY OWNED -- 222,100 Item 11: PERCENT OF CLASS REPRESENTED BY LINE 9 -- 5.34 Item 12: TYPE OF REPORTING PERSON -- IA - ----------------------------------------------------------------------- Page 3 of 4 ITEM 1(A). NAME OF ISSUER DAWSON GEOPHYSICAL C ITEM 1(B). ADDRESS OF ISSUER 208 South Marienfeld St. MIDLAND TX 79701-5113 ITEM 2(A). NAME OF PERSON FILING Dimensional Fund Advisors ITEM 2(B). ADDRESS OF PRINCIPAL BUSINESS OFFICE 1299 Ocean Avenue, 11th Floor, Santa Monica, CA 90401 ITEM 2(C). CITIZENSHIP A Delaware Corporation ITEM 2(D). TITLE OF CLASS OF SECURITIES Common Stock ITEM 2(E). CUSIP NUMBER 239359102 ITEM 3. This statement is filed pursuant to Rule 13d-1 (b), or 13d-2 (b) and the person filing is an investment advisor registered under section 203 of the Investment Advisors Act of 1940. - --------------------------------------------------------------------- Page 4 of 4 ITEM 4. OWNERSHIP ITEM 4(a). AMOUNT BENEFICIALLY OWNED See Page 2, Item No. 9 ITEM 4(b). PERCENT OF CLASS See Page 2, Item No. 11 ITEM 4(c). NUMBER OF SHARE AS TO WHICH SUCH PERSON HAS: (i). SOLE POWER TO VOTE OR DIRECT THE VOTE -- See Page 2, Item No. 5 (ii). SHARED POWER TO VOTE OR TO DIRECT THE VOTE -- None (iii). SOLE POWER TO DISPOSE OR TO DIRECT DISPOSITION OF -- See Page 2, Item No. 9 (iv). SHARE POWER TO DISPOSE OR TO DIRECT DISPOSISTION OF -- None ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS If this statement is being filed to report the fact that as of 12/31/96 the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: [ ] ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON All Securities reported upon in this schedule are onwed by advisory clients Dimensional Fund Advisors Inc., no one of which to the knowledge of Dimensional Fund Advisors Inc. owns more than 5% of the class 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 acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. 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 are correct. Signature Wednesday, February 5, 1997 Date Michael T. Scardina Vice President and Chief Finacial Officer Name/Title -----END PRIVACY-ENHANCED MESSAGE-----