EX-4.21



 Exhibit 4.21 
  

			
		  	STATE OF DELAWARE
		  	SECRETARY OF STATE
		  	DIVISION OF CORPORATIONS
		  	FILED 12:30 PM 10/29/2002
		  	020668752 – 3585292

 CERTIFICATE OF FORMATION 

OF 
 CROW CREEK
OPERATING COMPANY L.L.C. 
 The undersigned, acting as the organizer of a limited liability company under the Delaware Limited Liability
Company Act (the “Act”), does hereby adopt the following Certificate of Formation for such limited liability company: 

ARTICLE ONE 
 The
name of the limited liability company is Crow Creek Operating Company L.L.C. (the “Company”). 
 ARTICLE TWO

 The period of the Company’s duration shall commence as of October 29, 2002 and be perpetual, unless the Company
dissolves in accordance with the terms of its Operating Agreement. 
 ARTICLE THREE 

The purpose of the Company is to perform any activities that lawfully may be conducted by a limited liability company organized pursuant to
the Act. 
 ARTICLE FOUR 

The address of the initial registered office of the Company is 1209 Orange Street, Wilmington, Delaware 19801, and the name of its initial
registered agent at such address is The Corporation Trust Company. 
 ARTICLE FIVE 

The Company may have one or more managers, and the name of its initial managers are: 

Maurice Storm 
 Patrick Hall 

David Albin 
 Kenneth Hersh 

William Quinn 







 ARTICLE SIX 

To the fullest extent permitted by applicable law, no member, manager or officer of the Company shall be personally liable to the Company or
its members for monetary damages for an act or omission in such capacity. 
 Future amendments of applicable law may enlarge, but shall not
diminish, the limitation on the personal liability of a member, manager or officer. Similarly, any repeal or amendment of this Article, or the adoption of any other provision of this Certificate of Formation inconsistent with this Article, by the
members of the Company shall be prospective only and shall not adversely affect any limitation on the personal liability existing at the time of such repeal, amendment or adoption of an inconsistent provision. 

ARTICLE SEVEN 
 The
name of the organizer of the Company is Christopher Ray, whose address is 1700 Pacific Avenue, Suite 3300, Dallas, Texas 75201. 







 IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation on this the
29th day of October, 2002. 
  

	
	 




  

	Christopher Ray
	Organizer










			
		  	State of Delaware
		  	Secretary of State
		  	Division of Corporations
		  	Delivered 08:24 PM 04/20/2004
		  	FILED 08:19 PM 04/20/2004
		  	SRV 040289580 – 3585292 FILE

 CERTIFICATE OF AMENDMENT TO 

CERTIFICATE OF FORMATION OF 

CROW CREEK OPERATING COMPANY L.L.C. 

Crow Creek Operating Company L.L.C., a Delaware limited liability company (the “Company”), hereby certifies as follows: 

1. The name of the Company is Crow Creek Operating Company L.L.C. The Company’s original Certificate of Formation was filed with the
Secretary of State of the State of Delaware on October 29, 2002. 
 2. ARTICLE FIVE of the Certificate of Formation of the Company is
hereby amended to read in its entirety as follows: 
 “ARTICLE FIVE 

The Company shall be managed by its sole member or members.” 

IN WITNESS WHEREOF, the Company has caused this Certificate of Amendment to be signed by one of its managers on the 20th day of April,
2004. 
  

			
	Crow Creek Operating Company L.L.C.
		
	By:	 	 




  

		 	Patrick Hall
		 	Manager









 CERTIFICATE OF AMENDMENT 

TO 
 AMENDED CERTIFICATE
OF FORMATION 
 OF 

CROW CREEK OPERATING COMPANY L.L.C. 

Crow Creek Operating Company L.L.C., a Delaware limited liability company (the “Company”), hereby certifies as follows: 

1. The name of the Company is Crow Creek Operating Company L.L.C.; 

2. The Company’s original Certificate of Formation was filed with the Delaware Secretary of State on October 29, 2002; 

3. The Company filed a Certificate of Amendment to the original Certificate of Formation on April 20, 2004; and 

4. ARTICLE ONE of the original Certificate of Formation of the Company, as previously amended, is hereby amended to read in its entirety as
follows: 
 “ARTICLE ONE 

The name of the limited liability company is Penn Virginia MC Operating Company L.L.C.” 

IN WITNESS WHEREOF, the Company has caused this Certificate of Amendment to Amended Certificate of Formation to be signed by Patrick Hall this
13th day of June, 2006. 
  

			
	By:	 	 




  

		 	Patrick Hall, Authorized Person


  

					
		 		 	State of Delaware
		 		 	Secretary of State
		 		 	Division of Corporations
		 		 	Delivered 02:54 PM 06/13/2006
		 		 	FILED 02:44 PM 06/13/2006
		 		 	SRV 060569767 – 3585292 FILE