1 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 22, 1999 REGISTRATION NO. 333-78231 ================================================================================ SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ------------------ PRE-EFFECTIVE AMENDMENT NO. 4 TO FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ------------------ RANGE RESOURCES CORPORATION RANGE OPERATING COMPANY RANGE GAS COMPANY RANGE PRODUCTION COMPANY LOMAK FINANCING TRUST BUFFALO OILFIELD SERVICES, INC. RRC OPERATING COMPANY RANGE ENERGY SERVICES COMPANY RANGE ENERGY VENTURES CORPORATION RANGE RESOURCES DEVELOPMENT COMPANY GULFSTAR ENERGY, INC. RANGE ENERGY I, INC. GULFSTAR SEISMIC, INC. RANGE GATHERING & PROCESSING COMPANY (exact name of registrants as specified in their charters) DELAWARE 34-1312571 OHIO 34-1198756 DELAWARE 75-1722213 OHIO 34-1458616 DELAWARE 75-2423912 DELAWARE 34-1772901 DELAWARE 52-1996729 DELAWARE 52-2016991 DELAWARE 52-2016989 DELAWARE __________ OHIO 34-1570492 DELAWARE 76-0405733 DELAWARE 76-0328570 DELAWARE 76-0428570 (state or jurisdiction of incorporation or organization) (I.R.S. employer identification no.) 1311 (Primary Standard Industrial Classification Code Number) JOHN H. PINKERTON 500 THROCKMORTON STREET 500 THROCKMORTON STREET FORT WORTH, TEXAS 76102 FORT WORTH, TEXAS 76102 (817) 870-2601 (817) 870-2601 (Address, including zip code, (Name, address, including zip code, and telephone number, including area code, and telephone number, including of Registrant's principal executive offices) area code, of agent for service) ------------------ Copy to: J. MARK METTS VINSON & ELKINS L.L.P. 2300 FIRST CITY TOWER 1001 FANNIN HOUSTON, TEXAS 77002-6760 TELEPHONE: (713) 758-2222 ------------------ APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to time after this registration statement becomes effective. If the securities being registered on this form are being offered in connection with the formation of a holding company and there is compliance with General Instruction G, check the following box: [ ] If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [ ] If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 (the "Securities Act"), other than securities offered only in connection with dividend or interest reinvestment plans, please check the following box. [X] ------------------ THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE. ================================================================================

2 PART II INFORMATION NOT REQUIRED IN PROSPECTUS ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS Section 145 of the Delaware General Corporation Law authorizes, among other things, a corporation to indemnity any person ("indemnitee") who was or is party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the corporation), by reason of the fact that such person is or was an officer or director of such corporation, or is or was serving at the request of such corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise. The indemnity may include expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided that he acted in good faith and in a manner he reasonably believes to be in or not opposed to the best interests of the corporation and, with respect to any criminal action or proceeding, had no reasonable cause to believe his conduct was unlawful. A Delaware corporation may indemnify past or present officers and directors of such corporation or of another corporation or other enterprise at the former corporation's request, in an action by or in the right of the corporation to procure a judgment in its favor under the same conditions, except that no indemnification is permitted without judicial approval if such person is adjudged to be liable to the corporation. Where an officer or director is successful on the merits or otherwise in defense of any action referred to above, or in defense of any claim, issue or matter therein, the corporation must indemnify him against the expenses (including attorneys' fees) which he actually and reasonably incurred in connection therewith. Section 145 further provides that any indemnification shall be made by the corporation only as authorized in each specific case upon a determination by the (i) stockholders, (ii) Board of Directors by a majority vote of a quorum consisting of directors who were not parties to such action, suit or proceeding or (iii) independent counsel if a quorum of disinterested directors so directs. The indemnification pursuant to Section 145 is not exclusive of other rights of indemnification to which a person may be entitled. Section 145 of the DGCL also empowers Range to purchase and maintain insurance on behalf of any person who is or was an officer or director of Range against liability asserted against or incurred by him in any such capacity, whether or not Range would have the power to indemnify such officer or director against liability under the provisions of Section 145. Article SEVENTH, section (5) of Range's Certificate of Incorporation provides: Any former, present or future director, officer or employee of the Company or the legal representative of any such director, officer or employee shall be indemnified by the Company. (a) against reasonable costs, disbursements and counsel fees paid or incurred where such person has ben successful on the merits or otherwise in any pending, threatened or completed civil, criminal, administrative or arbitrative action, suit or proceeding, and any appeal therein and any inquiry or investigation which could lead to such action, suit or proceeding, or in defense of any claim, issue or matter therein, by reason of such person being or having been such director, officer or employee, and (b) with respect to any such action, suit, proceeding, inquiry or investigation for which indemnification is not made under (a) above, against reasonable costs, disbursements (which shall include amounts paid in satisfaction of settlements, judgments, fines and penalties, exclusive, however, of any amount paid or payable to the Company) and counsel fees if such person also had no reasonable cause to believe the conduct was unlawful, with the determination as to whether the applicable standard of conduct was met to be made by a majority of the members of the Board of Directors (sitting as a committee of the Board) who were not parties to such inquiry, investigation, action, suit or proceeding or by any one or more disinterested counsel to whom the question may be referred to the Board of Directors; provided, however, in connection with any proceeding by or in the right of the Company, no indemnification shall be provided as to any person adjudged by any court to be liable for negligence or misconduct except as and to the extent determined by such court. Article EIGHTH of Range's Certificate of Incorporation provides: No director of the Company shall be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director's duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the Delaware General Corporation Law, or (iv) for any transaction form which the director derived an improper personal benefit. This paragraph shall not eliminate or limit the liability of a director for any act or omission occurring prior to the effective date of its adoption. If the General Corporation Law of the State of Delaware is hereafter amended to authorize corporate action further limiting or eliminating the personal liability of directors, then the liability of a director to the Corporation shall be limited or eliminated to the fullest extent permitted by the General Corporation Law of the State of Delaware, as so amended from time to time. No repeal or modification of this Article VIII, directly or by adoption of an inconsistent provision of this Certificate of Incorporation, by the stockholders of the Corporation shall be effective 2

3 with respect to any cause of action, suit, claim or other matter, but for this Article VIII, would accrue or arise prior to such repeal or modification. Article XII of Range's Bylaws provides that each director, officer, employee and agent of Range shall be indemnified by Range to the fullest extent permitted by Delaware law, including any changes in Delaware law adopted in the future. All directors of Range have executed an indemnification agreement the form of which was approved by stockholders at Range's 1994 annual stockholders meeting. Article XII of Range's Bylaws also allows Range to purchase liability insurance for officers and directors and an insurance policy is currently in place. The preceding discussion of Range's Certificate of Incorporation, Section 145 of the General Corporation Law of the State of Delaware, our Bylaws and the indemnification agreements is not intended to be exhaustive and is qualified in its entirety by the Certificate of Incorporation, the Bylaws, Section 145 of the General Corporation Law of the State of Delaware, and the indemnification agreements. ITEM 21. EXHIBITS There are filed with this Registration Statement the following exhibits: EXHIBIT NUMBER Description - ------ ----------- 1.1* -- Form of Equity Underwriting Agreement. 1.2* -- Form of Debt Securities Underwriting Agreement 3.1 -- Certificate of Incorporation dated March 24, 1980 (incorporated by reference to Range's Registration Statement (No. 33-31558) 3.2 -- Certificate of Amendment of Certificate of Incorporation dated July 22, 1981 (incorporated by reference to Range's Registration Statement (No. 33-31558)) 3.3 -- Certificate of Amendment of Certificate of Incorporation dated September 8, 1982 (incorporated by reference to Range's Registration Statement (No. 33-31558)) 3.4 -- Certificate of Amendment of Certificate of Incorporation dated July 22, 1981 (incorporated by reference to Range's Registration Statement (No. 33-31558)) 3.5 -- Certificate of Amendment of Certificate of Incorporation dated August 31, 1989 (incorporated by reference to Range's Registration Statement (No. 33-31558)) 3.6 -- Certificate of Amendment of Certificate of Incorporation dated May 30, 1991 (incorporated by reference to Range's Registration Statement (No. 333-20257)) 3.7 -- Certificate of Amendment of Certificate of Incorporation dated November 20, 1992 (incorporated by reference to Range's Registration Statement (No. 333-20257)) 3

4 3.8 -- Certificate of Amendment of Certificate of Incorporation dated May 24, 1996 (incorporated by reference to Range's Registration Statement (No. 333-20257)) 3.9 -- Certificate of Amendment of Certificate of Incorporation dated October 2, 1996 (incorporated by reference to Range's Registration Statement (No. 333-20257)) 3.10 -- Restated Certificate of Incorporation as required by Item 102 of Regulation S-T (incorporated by reference to Range's Registration Statement (No. 333-20257)) 3.11 -- Certificate of Amendment of Certificate of Incorporation dated August 25, 1998 (incorporated by reference to Range's Registration Statement (No. 333-62439)) 3.12 -- Amended and Restated By-Laws of Range (incorporated by reference to Range's Registration Statement (No. 33-31558)) 4.1 -- Certificate of Incorporation of Range, as amended (incorporated by reference to Exhibits 3.1 through 3.11) 4.2 -- Amended and Restated By-Laws of Range (incorporated by reference to Exhibit 3.12) 4.3** -- Form of Indenture between Range and one or more commercial banks to be named, as trustee. 4.4* -- Form of Senior Debt Security. 4.5* -- Form of Subordinated Debt Security. 4.6* -- Form of Deposit Agreement. 4.7* -- Form of Depositary Receipt. 4.8* -- Form of Warrant Agreement. 4.9* -- Form of Warrant Certificate. 4.10* -- Form of Guarantee. 4.11 -- Specimen certificate of Lomak Petroleum, Inc. (incorporated by reference to the Company's Registration Statement (No. 333-20257)). 4.12 -- Certificate of Trust of Lomak Financing Trust (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 4.13 -- Amended and Restated Declaration of Trust of Lomak Financing Trust dated 4

5 as of October 22, 1997 by The Bank of New York (Delaware) and the Bank of New York as Trustees and Lomak Petroleum, Inc. as Sponsor (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 4.14 -- Indenture dated as of October 22, 1997, between Lomak Petroleum, Inc. and The Bank of New York (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 4.15 -- First Supplemental Indenture dated as of October 22, 1997, between Lomak Petroleum, Inc. and The Bank of New York (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 4.16 -- Form of 5 3/4% Preferred Convertible Securities (included in Exhibit 4.5 above). 4.17 -- Form of 5 3/4% Convertible Junior Subordinated Debentures (included in Exhibit 4.7 above). 4.18 -- Convertible Preferred Securities Guarantee Agreement dated October 22, 1997, between Lomak Petroleum, Inc., as Guarantor, and The Bank of New York as Preferred Guarantee Trustee (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 4.19 -- Common Securities Guarantee Agreement dated October 22, 1997, between Lomak Petroleum, Inc., as Guarantor, and The Bank of New York as Common Guarantee Trustee. (incorporated by reference to the Company's Registration Statement No. 333-43823)). 4.20 -- Purchase and Sale Agreement between Cometra Energy, L.P. and Cometra Production Company, L.P., as seller, and Lomak Petroleum, Inc., as buyer, dated December 31, 1996, including First Amendment to Purchase and Sale Agreement, dated January 10, 1997 (incorporated by reference to the Company's Registration Statement (No. 333-20257)). 4.21 -- Purchase and Sale Agreement between Rockland, L.P., as seller, and Lomak Petroleum, Inc., as buyer, dated December 31, 1996 (incorporated by reference on the Company's Registration Statement (No. 333-20257)). 4.22 -- Form of Trust Indenture relating to the Senior Subordinated Notes due 2007 between Lomak Petroleum, Inc., and Fleet National Bank as trustee (incorporated on the Company's Registration Statement (No. 333-20257)). 4.23 -- Purchase and Sale Agreement dated as of September 8, 1997 by and among Cabot Oil & Gas Corporation, Cranberry Pipeline Corporation, Big Sandy Gas Company, and Lomak Petroleum, Inc. (incorporated by reference to Form 10-K dated March 20, 1998). 4.24 -- Agreement and Plan of Reorganization dated December 5, 1997 between Arrow Operating Company, Kelly W. Hoffman and L.S. Decker and Lomak 5

6 Petroleum, Inc. (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 5.1+ -- Form of opinion of Vinson & Elkins L.L.P. as to the legality of the securities to be registered. 10.1 -- Incentive and Non-Qualified Stock Option Plan dated March 13, 1989 (incorporated by reference to the Company's Registration Statement (No. 33-31558)). 10.2 -- Advisory Agreement dated September 29, 1988 between Lomak and SOCO (incorporated by reference to the Company's Registration Statement (No. 33-31558)). 10.3 -- 401(k) Plan Document and Trust Agreement effective January 1, 1989 (incorporated by reference to the Company's Registration Statement (No. 33-31558)). 10.4 -- 1989 Stock Purchase Plan (incorporated by reference to the Company's Registration Statement (No. 33-31558)). 10.5 -- Form of Directors Indemnification Agreement (incorporated by reference to the Company's Registration Statement (No. 333-47544)). 10.6 -- 1994 Outside Directors Stock Option Plan (incorporated by reference to the Company's Registration Statement (No. 33-47544)). 10.7 -- 1994 Stock Option Plan (incorporated by reference to the Company's Registration Statement (No. 33-47544)). 10.8 -- $400,000,000 Credit Agreement Among Lomak Petroleum, Inc., as Borrower, and the Several Lenders from Time to Time parties Hereto, including Bank One, Texas, N.A. as Administrative Agent, The Chase Manhattan Bank, as Syndication Agent, and Nationsbank of Texas, N.A., as Documentation Agent (incorporated by reference to Form 10-K dated February 7, 1997). 10.9 -- Registration Rights Agreement dated October 22, 1997, by and among Lomak Petroleum, Inc., Lomak Financing Trust, Morgan Stanley & Co. Incorporated, Credit Suisse First Boston, Forum Capital markets L.P. and McDonald Company Securities, Inc., (incorporated by reference to the Company's Registration Statement (No. 333-43823)). 10.10 -- Amendment to the Lomak Petroleum, Inc., 1989 Stock Purchase Plan, as amended (incorporated by reference to the Company's Registration Statement (No. 333-44821)). 10.11 -- 1997 Stock Purchase Plan (incorporated by reference to the Company's Registration Statement (No. 333-44821)). 6

7 10.12 -- 1997 Stock Purchase Plan, as amended (incorporated by reference to the Company's Registration Statement (No. 333-44821)). 10.13 -- Fourth Amendment to $400,000,000 Credit Agreement dated January 27, 1999 (incorporated by reference to Form 10-K dated March 15, 1999). 10.14 -- Second Amended and Restated 1996 Stock Purchase and Option Plan for Key Employees of Domain Energy Corporation and Affiliates (incorporated by reference to the Company's Registration Statement (No. 333-62439)). 10.15 -- Domain Energy Corporation 1997 Stock Option Plan for Nonemployee Directors (incorporated by reference to the Company's Registration Statement (No. 333-62439)). 10.16 -- Employment Agreement, dated August 25, 1998, between the Company and Michael V. Ronca (incorporated by reference to Form 10-K dated March 15, 1999). 10.17 -- Credit Agreement, dated as of June 7, 1996, between Domain Finance Corporation and Compass Bank--Houston (including the First and the Second Amendment thereto) (incorporated by reference to Exhibit 10.3 of Domain Energy Corporation's Registration Statement on Form S-1 filed with the Commission on April 4, 1997 and Exhibit 10.3 of Amendment No. 1 to Domain Energy Corporation's Registration Statement on Form S-1 filed with the Commission on May 21, 1997) (File No. 333-24641). 12.1 -- Computation of Ratios of Earnings to Fixed Charges and Earnings to Fixed Charges and Preferred Stock Dividends (incorporated by reference to Range's registration statement on Form S-3, filed as of April 22, 1999). 21.1 -- Subsidiaries of the Registrant (incorporated by reference to Form 10-K dated March 15, 1999). 23.1+ -- Consent of Arthur Andersen LLP. 23.2+ -- Consent of Vinson & Elkins L.L.P. (included in the opinion filed as Exhibit 5.1 to this Registration Statement). 24.1** -- Powers of Attorney of directors and officers of Range and Subsidiary Guarantors. 25.1* -- Form T-1 Statement for Eligibility under Trust Indenture Act of 1933 of Trustee. - --------------- + Filed herewith. * To be filed. ** Previously filed. 7

8 ITEM 22. UNDERTAKINGS The undersigned registrants hereby undertake: (1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: (i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii) To reflect in the prospectus any facts or events arising after the effective date of this registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this registration statement; and (iii) To include any material information with respect to the plan of distribution not previously disclosed in this registration statement or any material change to such information in this registration statement; (2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof; (3) To remove from registration by means of a post-effective amendment any of the securities being registered that remain unsold at the termination of the offering. (4) That, for purposes of determining any liability under the Securities Act of 1933, each filing of Range's annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 that is incorporated by reference in this registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of the securities at that time shall be deemed to be the initial bona fide offering thereof. (5) That prior to any public reoffering of the securities registered hereunder through use of a prospectus which is a part of this registration statement, by any person or party who is deemed to be an underwriter within the meaning of Rule 145(c), the issuer undertakes that such reoffering prospectus will contain the information called for by the applicable registration form with respect to reofferings by persons who may be deemed underwriters, in addition to the information called for by the other items of the applicable form. (6) That every prospectus: (i) that is filed pursuant to paragraph (5) immediately preceding, or (ii) that purports to meet the requirements of section 10(a)(3) of the Act and is used in connection with an offering of securities subject to Rule 415, will be filed as a part of an amendment to the registration statement and will not be used until such amendment is effective, and that, for purposes of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. (7) To respond to requests for information that is incorporated by reference into the prospectus pursuant to Items 4, 10(b), 11, or 13 of this Form, within one business day of receipt of such request, and to send the incorporated documents by first class mail or other equally prompt means. This includes information contained in documents filed subsequent to the effective date of the registration statement through the date of responding to the request. (8) To supply by means of a post-effective amendment all required information concerning a transaction, and the company being acquired involved therein, that was not the subject of and included in the registration statement when it became effective. (9) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers, and controlling persons of the registrants pursuant to the provisions described in Item 15 above or otherwise, the registrants have been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrants of expenses incurred or paid by a director, officer, or controlling person of the registrant in the successful defense of any action, suit, or proceeding) is asserted by the director, officer, or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of the issue. (10) The undersigned registrants hereby undertake to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act of 1939 in accordance with the rules and regulations prescribed by the SEC under Section 305(b)(2) of the Trust Indenture Act of 1939. 8

9 SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this Amendment No. 4 to Registration Statement on Form S-4 to be signed on its behalf by the undersigned, thereunto duly authorized, in Fort Worth, Texas, on September 22, 1999. RANGE RESOURCES CORPORATION By: /s/ John H. Pinkerton ------------------------------------- John H. Pinkerton President and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this Amendment No. 4 to Registration Statement has been signed by the following persons in the capacities and on the dates indicated. SIGNATURE TITLE DATE --------- ----- ---- * Chairman and Chairman of the Board September 22, 1999 - ------------------------------- Thomas J. Edelman * Chief Executive Officer, President and September 22, 1999 - ------------------------------- Director John H. Pinkerton * Chief Operating Officer, and Director September 22, 1999 - ------------------------------- Michael V. Ronca /s/ Thomas W. Stoelk Chief Financial Officer and Senior Vice September 22, 1999 - ------------------------------- President - Finance & Administration Thomas W. Stoelk * Chief Accounting Officer and Vice September 22, 1999 - ------------------------------- President and Controller Geoffrey T. Doke * Director September 22, 1999 - ------------------------------- Robert E. Aikman * Director September 22, 1999 - ------------------------------- Allen Finkelson * Director September 22, 1999 - ------------------------------- Anthony V. Dub * Director September 22, 1999 - ------------------------------- Ben A. Guill * Director September 22, 1999 - ------------------------------- Jonathan S. Linker * The undersigned, by signing his name hereto, does sign and execute this Amendment No. 4 to Registration Statement on Form S-4 on September 22, 1999, pursuant to powers of attorney executed on behalf of the above-named officers and directors and previously filed with the Securities and Exchange Commission. By: /s/ Thomas W. Stoelk ------------------------------- Thomas W. Stoelk Attorney-in-fact

10 SIGNATURES Pursuant to the requirements of the Securities Act of 1933, each of the registrants has duly caused this Amendment No. 4 to Registration Statement on Form S-4 to be signed on its behalf by the undersigned, thereunto duly authorized, in Fort Worth, Texas, on September 22, 1999. RANGE OPERATING COMPANY RANGE PRODUCTION COMPANY BUFFALO OILFIELD SERVICES, INC. RANGE ENERGY SERVICES COMPANY RESOURCES DEVELOPMENT COMPANY RANGE ENERGY I, INC. RANGE GATHERING & PROCESSING COMPANY RANGE GAS COMPANY RRC OPERATING COMPANY RANGE ENERGY VENTURES CORPORATION GULFSTAR ENERGY, INC. GULFSTAR SEISMIC, INC. By: /s/ John H. Pinkerton ----------------------------------------- John H. Pinkerton President and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this Amendment No. 4 to Registration Statement on Form S-4 has been signed by the following persons in the capacities and on the dates indicated. SIGNATURE TITLE DATE --------- ----- ---- * Director, Chief Executive Officer and September 22, 1999 - ------------------------------- President (principal executive officer) John H. Pinkerton /s/ Thomas W. Stoelk Director and Senior Vice President - September 22, 1999 - ------------------------------- Finance (principal financial and Thomas W. Stoelk accounting officer) * Director and Chief Operating Officer September 22, 1999 - ------------------------------- Michael V. Ronca * The undersigned, by signing his name hereto, does sign and execute this Amendment No. 4 to Registration Statement on Form S-4 on September 22, 1999, pursuant to powers of attorney executed on behalf of the above-named officers and directors and previously filed with the Securities and Exchange Commission. By: /s/ Thomas W. Stoelk ------------------------------- Thomas W. Stoelk Attorney-in-fact

11 SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this Amendment No. 4 to Registration Statement on Form S-4 to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Fort Worth, State of Texas, on September 22, 1999. LOMAK FINANCING TRUST By: /s/ John H. Pinkerton ------------------------------------- John H. Pinkerton, Trustee By: /s/ Thomas W. Stoelk ------------------------------------- Thomas W. Stoelk, Trustee

12 INDEX TO EXHIBITS EXHIBIT NUMBER DESCRIPTION -------------- ----------- 5.1 Opinion of Vinson & Elkins L.L.P. 23.1 Consent of Independent Public Accountants

1 EXHIBIT 5.1 [VINSON & ELKINS LETTERHEAD] September 22, 1999 Range Resources Corporation 500 Throckmorton Street Fort Worth, Texas 76102 Range Resources Corporation Registration Statement on Form S-4 Debt Securities Common Stock, par value $.01 per share Preferred Stock, par value $1.00 per share Depositary Shares Warrants and Guarantees of Debt Securities Ladies and Gentlemen: We have acted as counsel for Range Resources Corporation, a Delaware corporation (the "Company"), in connection with the registration under the Securities Act of 1933 (the "Securities Act"), on a Registration Statement on Form S-4 (the "Registration Statement") of the offer and sale from time to time pursuant to Rule 415 under the Securities Act of the following securities for an aggregate initial offering price not to exceed $125,000,000: (i) debt securities of the Company ("Debt Securities"); (ii) shares of common stock, par value $.01 per share, of the Company ("Common Stock"); (iii) shares of preferred stock, par value $1.00 per share, of the Company ("Preferred Stock"); (iv) depositary shares representing fractional interests in Preferred Stock ("Depositary Shares");(v) warrants to purchase Debt Securities, Preferred Stock or Common Stock (the "Warrants"); and (vi) guarantees of Debt Securities (the "Guarantees" and, together with the Debt Securities, Preferred Stock, Depositary Shares, Common Stock and Warrants, the "Securities"). For purposes of rendering the opinions contained in this letter, we have reviewed those agreements, records and documents as we have deemed relevant in order to render the opinions set forth herein, including but not limited to (a) the Certificate of Incorporation and the Bylaws of the Company, (b) the Certificate of Incorporation and the Bylaws of the subsidiaries of the Company that are listed on the signature pages of the Registration Statement (the "Subsidiary Guarantors"), and (c) the Indenture in the form of Exhibit 4.3 to the Registration Statement to be executed by the Company and the trustee (the "Indenture"), pursuant to which Debt Securities may be issued. As to certain questions of fact material to our opinions that we have not independently established, we have relied upon certificates from officers of the Company and the Subsidiary Guarantors and upon certificates of public officials. In rendering the following opinions, we have assumed (a) all information contained in all documents reviewed by us is true and correct, (b) the genuineness of all signatures on all documents reviewed by us, (c) the authenticity and completeness of all documents submitted to us as originals, (d) the conformity to authentic originals of all documents submitted to us as certified or photostatic copies, (e) each natural person signing any document reviewed by us had the legal capacity to do so, and (f) each person signing in a representative capacity any document reviewed by us had authority to sign in such capacity. Based on the foregoing, and subject to the assumptions, exceptions and qualifications stated below, we are of the opinion that: 1. With respect to Debt Securities to be issued under the Indenture, when (a) the Indenture has been duly authorized and validly executed and delivered by the Company to the trustee, and has been duly executed by the trustee, (b) the Indenture has been duly qualified under the Trust Indenture Act of 1939, (c) the Company's Board of Directors or, to the extent permitted by Section 141(c) of the General Corporation Law of the State of Delaware, a duly constituted and acting committee thereof (such Board of Directors or committee being hereinafter referred to as the "Board") has taken all necessary corporate action to approve the issuance and terms of such Debt Securities, the terms of the offering thereof and related matters, and (d) such Debt Securities have been duly executed, authenticated, issued and delivered in accordance with the provisions of the Indenture and the applicable definitive purchase, underwriting or similar agreement approved by the Board upon payment of the consideration therefor provided for therein, such Debt Securities will be legally issued and will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms.

2 2. With respect to shares of Common Stock, when both (a) the Board has taken all necessary corporate action to approve the issuance of and the terms of the offering of the shares of Common Stock and related matters and (b) certificates representing the shares of Common Stock have been duly executed, countersigned, registered and delivered either (i) in accordance with the applicable definitive purchase, underwriting or similar agreement approved by the Company's Board upon payment of the consideration therefor (not less than the par value of the Common Stock) provided for therein or (ii) upon conversion or exercise of any other Security, in accordance with the terms of such Security or the instrument governing such Security providing for such conversion or exercise as approved by the Board, for the consideration approved by the Board (not less than the par value of the Common Stock), then the shares of Common Stock will be legally issued, fully paid and nonassessable. 3. With respect to shares of Preferred Stock, when both (a) the Board has taken all necessary corporate action to approve the issuance and terms of the shares of Preferred Stock, the terms of the offering thereof, and related matters, including the adoption of a Certificate of Designation relating to such Preferred Stock (a "Certificate") and the filing of the Certificate with the Secretary of State of the State of Delaware, and (b) certificates representing the shares of Preferred Stock have been duly executed, countersigned, registered and delivered either (i) in accordance with the applicable definitive purchase, underwriting or similar agreement approved by the Board upon payment of the consideration therefor (not less than the par value of the Preferred Stock) provided for therein or (ii) upon conversion or exercise of any other Security, in accordance with the terms of such Security or the instrument governing such Security providing for such conversion or exercise as approved by the Board, for the consideration approved by the Board (not less than the par value of the Preferred Stock), then the shares of Preferred Stock will be legally issued, fully paid and non assessable. 4. With respect to Depositary Shares, when (a) the Board has taken all necessary corporate action to approve the issuance and terms of the Depositary Shares, the terms of the offering thereof, and related matters, including the adoption of a Certificate relating to the Preferred Stock underlying such Depositary Shares and the filing of the Certificate with the Secretary of State of the State of Delaware, (b) the Depositary Agreement or Agreements relating to the Depositary Shares and the related Depositary Receipts have been duly authorized and validly executed and delivered by the Company and the Depositary appointed by the Company, (c) the shares of Preferred Stock underlying such Depositary Shares have been deposited with a bank or trust company (which meets the requirements for the Depositary forth in the Registration Statement) under the applicable Depositary Agreements, and (d) the Depositary Receipts representing the Depositary Shares have been duly executed, countersigned, registered and delivered in accordance with the appropriate Depositary Agreement and the applicable definitive purchase, underwriting or similar agreements approved by the Board upon payment of the consideration therefore provided for therein, the Depositary Shares will be legally issued. 5. With respect to the Warrants, when (a) the Board has taken all necessary corporate action to approve the creation of and the issuance and terms of the Warrants, the terms of the offering thereof, and related matters (b) the warrant agreement or agreements relating to the Warrants have been duly authorized and validly executed and delivered by the Company and the warrant agent appointed by the Company, and (c) the Warrants or certificates representing the Warrants have been duly executed, countersigned, registered and delivered in accordance with the appropriate warrant agreement or agreements and the applicable definitive purchase, underwriting or similar agreement approved by the Company's Board upon payment of the consideration therefor provided for therein, the Warrants will be legally issued and valid and binding obligations of the Company. 6. With respect to Guarantees, when (a) the Indenture or an appropriate supplemental indenture, if any, has been duly authorized and validly executed and delivered by a Subsidiary Guarantor to the Trustee and any such supplemental indenture has been duly executed by the trustee, (b) such Subsidiary Guarantor's Board of Directors has taken all necessary corporate action to approve the issuance and terms of such Guarantees, the terms of the offering thereof and related matters, (c) the related Debt Securities have been properly issued as contemplated in paragraph 1 of this opinion, and (d) the Subsidiary Guarantees have been duly executed, issued and delivered in accordance with the provisions of the Indenture (if applicable) and the applicable definitive purchase, underwriting or similar agreement approved by such Subsidiary Guarantor's Board of Directors upon the payment of the consideration therefor provided for therein, such Subsidiary Guarantees will be legally enforceable against the Guarantor in accordance with their terms. The opinions expressed above are subject in all respects to the following assumption, exceptions and qualifications: a. We have assumed that (a) the Registration Statement and any amendments thereto (including post-effective amendments) will have become effective and comply with all applicable laws; (b) the Registration Statement will be effective and will comply with all applicable laws at the time the Securities are offered or issued as contemplated by the Registration Statement (if such offering or issuance requires the delivery of a prospectus under the Securities Act or pursuant to any other law); (c) a Prospectus Supplement will have been prepared and filed with the Securities and Exchange Commission describing the Securities offered thereby and will comply with all applicable laws; (d) all Securities will be issued and sold in compliance with applicable federal and state securities laws and in the manner stated in the Registration Statement and the appropriate Prospectus Supplement; (e) a definitive purchase, underwriting or similar agreement with respect to any Securities offered or issued will have been duly authorized and validly executed and delivered by the Company and the other parties thereto; and (f) any Securities issuable upon conversion, exchange or exercise of any Security being offered or issued will be duly authorized, created and, if appropriate, reserved for issuance upon such conversion, exchange or exercise.

3 b. In rendering the opinions in paragraph 1 and 6, we have assumed that the trustee is or, at the time the Indenture is signed, will be qualified to act as trustee under the Indenture and that the trustee has or will have duly executed and delivered the Indenture. c. The enforceability of the Indenture and the Subsidiary Guarantees and provisions thereof may be limited by bankruptcy, insolvency, reorganization, fraudulent transfer, moratorium or other similar laws now or hereinafter in effect relating to or affecting enforcement of creditors' rights generally and by general principles of equity (regardless of whether such enforcement is considered in a proceeding in equity or at law). Such principles or equity include, without limitation, concepts of materiality, reasonableness, good faith and fair dealing, and also to the possible unavailability of specific performance or injunctive relief. d. We express no opinion with respect to (a) the enforceability of provisions in the Indenture, Subsidiary Guarantees, or any other agreement or instrument with respect to delay or omission of enforcement of rights or remedies, or waivers of notices or defenses, or waivers of benefits of, or other rights that cannot be effectively waived under, applicable laws or (b) the enforceability of indemnification provisions to the extent they purport to relate to liabilities resulting from or based upon negligence or any violation of federal or state securities or blue sky laws. e. The opinions expressed in this letter are limited to the laws of the States of Texas, Delaware and New York and the federal laws of the United States of America. We consent to the filing of this opinion of counsel as Exhibit 5.1 to the Registration Statement. We also consent to the reference to this firm under the heading "Legal Opinions" in the Prospectus forming a part of the Registration Statement. In giving this consent, we do not admit that this firm is in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Securities and Exchange Commission promulgated thereunder. This opinion is rendered on the date hereof and we disclaim any duty to advise you regarding any changes in the matters addressed herein. Very truly yours, /s/ VINSON & ELKINS L.L.P.

1 EXHIBIT 23.1 ARTHUR ANDERSEN LLP Arthur Andersen LLP Suite 1800 200 Public Square Cleveland, OH 44114 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the use of our report (and to all reference to our Firm) incorporated by reference in this registration statement. ARTHUR ANDERSEN LLP Cleveland, Ohio September 22, 1999