EX-4.15

FIRST: The name of the corporation is Crow Creek Holding Corporation (the “Corporation”).

SECOND: The address of the Corporation’s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801. The name of its registered agent at such address is The Corporation Trust Company.

THIRD: The nature of the business or purpose to be conducted or promoted by the Corporation is to engage in the oil and gas business and in any other lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware.

FOURTH: The aggregate number of shares which the Corporation shall have authority to issue is One Thousand (1,000), of the par value of $.01 each, to be designated “Common Stock”.

FIFTH: The name of the incorporator of the Corporation is Christopher Ray and the mailing address of such incorporator is 1700 Pacific Avenue, Suite 3300, Dallas, Texas 75201.

SIXTH: The following provisions are inserted for the management of the business and for the conduct of the affairs of the Corporation, and for further definition, limitation and regulation of the powers of the Corporation and of its directors and stockholders:

(a) Management. The business and affairs of the Corporation shall be managed by or under the direction of the Board of Directors.

(b) Number of Directors. The number of directors of the Corporation shall be not less than three nor more than seven as fixed from time to time by or pursuant to the Bylaws of the Corporation. Each director shall hold office until his or her successor is elected and qualifies or until his or her earlier resignation or removal. Election of directors need not be by written ballot unless the Bylaws of the Corporation so provide.

(c) Initial Directors. The names and mailing addresses of the persons who are to serve as directors until the first annual meeting of the holders of capital stock of the Corporation or until their successors are elected and qualify are:

SEVENTH: (a) Elimination of Certain Liability of Directors. To the fullest extent permitted by the Delaware General Corporation Law as the same exists or may hereafter be amended, a director of the Corporation shall not be personally liable to the Corporation or its stockholders for monetary damages for breach of duty as a director. Without limiting the foregoing in any respect, a director of the Corporation shall not be personally liable to the Corporation or its stockholders for monetary damages for breach of 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 from which the director derived an improper personal benefit If the Delaware General Corporation Law is amended to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of a director of the Corporation shall be eliminated or limited to the fullest extent permitted by the Delaware General Corporation Law, as so amended. Any repeal or modification of this provision shall not adversely affect any right or protection of a director of the Corporation existing at the time of such repeal or modification.

(i) Right to Indemnification. (A) Each person who was or is made a party or is threatened to be made a party to or is involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (hereinafter a “proceeding”), by reason of the fact that he or she, or a person of whom he or she is the legal representative, is or was a director or officer of the Corporation, or serves, in any capacity, any corporation, partnership or other entity in which the Corporation has a partnership or other interest, including without limitation service with respect to employee benefit plans, whether the basis of such proceeding ii alleged action in an official capacity as a director, officer, employee or agent or in any other capacity while serving as a director, officer, employee or agent, shall be indemnified and held harmless by the Corporation to the fullest extent authorized by the Delaware General Corporation Law, as the same exists or may hereafter be amended (but, in case of any such amendment, only to the extent that

such amendment permits the Corporation to provide broader indemnification rights than said law permitted the Corporation to provide prior to such amendment), against all expense, liability and loss (including without limitation attorneys’ fees, judgments, fines, ERISA excise taxes or penalties and amounts paid or to be paid in settlement) reasonably incurred or suffered by such person in connection therewith and such indemnification shall continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of his or her heirs, executors and administrators; and (B) the Corporation shall indemnify and hold harmless in such manner any person designated by the Board of Directors, or any committee thereof, as a person subject to this indemnification provision, and who was or is made a party or is threatened to be made a party to a proceeding by reason of the fact that he, she or a person of whom he or she is the legal representative, is or was serving at the request of the Board of Directors of the Corporation as a director, officer, employee or agent of another corporation or a partnership, joint venture, trust or other enterprise whether such request is made before or after the acts taken or allegedly taken or events occurring or allegedly occurring which give rise to such proceeding; provided, however, that, except as provided in subsection (b)(ii) of this Article SEVENTH, the Corporation shall indemnify any such person seeking indemnification pursuant to this subsection (i) in connection with a proceeding (or part thereof) initiated by such person only if such proceeding (or part thereof) was authorized by the Board of Directors of the Corporation. The right to indemnification conferred herein shall be a contract right based upon an offer from the Corporation which shall be deemed to have been made to a person subject to clause (A) of this subsection (i) on the date hereof and to a person subject to clause (B) of this subsection (i) on the date designated by the Board of Directors, shall be deemed to be accepted by such person’s service or continued service as a director or officer of the Corporation for any period after the offer is made and shall include the right to be paid by the Corporation the expenses incurred in defending any such proceeding in advance of its final disposition; provided, however, that if the Delaware General Corporation Law requires, the payment of such expenses incurred by a director or officer in his or her capacity as the director or officer (and not in any other capacity in which service was or is rendered by such person while a director or officer, including without limitation service to an employee benefit plan) in advance of the final disposition of a proceeding, shall be made only upon delivery to the Corporation of an undertaking, by or on behalf of such director or officer, to repay all amounts so advanced if it shall ultimately be determined that such director or officer is not entitled to be indemnified under this subsection (i) or otherwise. The Corporation may, by action of its Board of Directors, provide indemnification to employees or agents of the Corporation with the same scope and effect as the foregoing indemnification of directors and officers.

(ii) Right of Claimant to Bring Suit. If a claim under Section (b)(i) of this Article SEVENTH is not paid in full by the Corporation within 30 days after a written claim has been received by the Corporation, the claimant may at any time thereafter bring Suit against the Corporation to recover the unpaid amount of the claim and, if successful in whole or in part, the claimant shall be entitled to be paid also the expense of prosecuting such claim. It shall be a defense to any such action (other than an action brought to enforce a claim for expenses incurred in defending any proceeding in advance of its final disposition where the required undertaking, if any is required, has been tendered to the Corporation) that the claimant has not met the standards of conduct which make it permissible under the Delaware General Corporation Law for the Corporation to indemnify the claimant for the amount claimed. Neither the failure of the Corporation (including its Board of Directors, independent legal counsel, or its stockholders) to have made a determination prior to the commencement of such action that indemnification of the claimant is proper in the circumstances because he or she has met the applicable standard of conduct set forth in the Delaware General Corporation Law, nor an actual determination by the Corporation (including its Board of Directors, independent legal counsel, or its stockholders) that the claimant has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that the claimant has not met the applicable standard of conduct.

(iii) Nonexclusivity of Rights. The right to indemnification and the payment of expenses incurred in defending a proceeding in advance of its final disposition conferred in this Section (b) shall not be exclusive of any right which any person may have or hereafter acquire under any statute, provision of the Certificate of Incorporation, by-law, agreement, vote of stockholders or disinterested directors or otherwise.

(iv) Insurance. The Corporation may maintain insurance, at its expense, to protect itself and any director officer, employee or agent of the Corporation or another corporation, partnership, joint venture, trust or other enterprise against any such expense, liability or loss, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the Delaware General Corporation Law.

(v) Severability. If any subsection of this Section (b) shall be deemed to be invalid or ineffective in any proceedings, the remaining subsections hereof shall not be affected and shall remain in full force and effect.

EIGHTH: The Corporation reserves the right to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon stockholders herein are granted subject to this reservation.

IN WITNESS WHEREOF, the undersigned, being the incorporator hereinbefore named, for the purpose of forming a corporation pursuant to the General Corporation Law of the State of Delaware, does hereby make and file this Certificate of Incorporation, hereby declaring and certifying that the facts herein stated are true, and accordingly has hereunto set the incorporator’s hand this 29th day of October, 2002.

LOGO

Christopher Ray

Crow Creek Holding Corporation, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware (the “Corporation”), DOES HEREBY CERTIFY.

FIRST: That the Board of Directors of the Corporation, by the unanimous written consent of its members, adopted a resolution proposing and declaring advisable the following amendment to the Certificate of Incorporation of the Corporation:

RESOLVED, that the Certificate of Incorporation of Crow Creek Holding Corporation be amended by changing Article FIRST thereof so that, as amended, said Article shall be and read in its entirety as follows:

SECOND: That in lieu of a meeting and vote of the sole stockholder, the sole stockholder has given written consent to said amendment in accordance with the provisions of Section 228 of the General Corporation Law of the State of Delaware.

THIRD: That said amendment was duly adopted in accordance with the applicable provisions of Sections 242 and 228 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, Crow Creek Holding Corporation has caused this Certificate of Amendment to Certificate of Incorporation to be signed by Patrick Hall, its Vice President this 13^th day of June, 2006.


CROW CREEK HOLDING CORPORATION

By:
		Patrick Hall, Vice President


Name:		Mailing Address:

David Albin		100 N. Guadalupe St.
		Suite 205
		Santa Fe, NM 87501


Kenneth Hersh		125 E. John Carpenter Fwy. Suite 600 Irving, TX 75062

William Quinn		125 E. John Carpenter Fwy. Suite 600 Irving, TX 75062

Maurice Storm		2100 South Utica Avenue, Suite 200 Tulsa, OK 74114

Patrick Hall		2100 South Utica Avenue, Suite 200 Tulsa, OK 74114