1001 Uses in Date of Closing Clause

Date of Closing from Purchase and Sale Agreement

This PURCHASE AND SALE AGREEMENT (this "Agreement") is executed as of the 5th day of May, 2014 (the "Execution Date"), and is between QEP Energy Company, a Texas corporation ("Seller"), and EnerVest Energy Institutional Fund XIII-A, L.P., a Delaware limited partnership ("EnerVest XIII-A"), EnerVest Energy Institutional Fund XIII-WIB, L.P., a Delaware limited partnership ("EnerVest XIII-WIB"), EnerVest Energy Institutional Fund XIII-WIC, L.P., a Delaware limited partnership ("EnerVest XIII-WIC," and collectively with EnerVest XIII-A and EnerVest XIII-WIB, "EnerVest"), FourPoint Energy, LLC, a Colorado limited liability company ("FourPoint," and collectively with EnerVest, "Buyer") and EnerVest, Ltd., a Texas limited partnership ("EV") solely for the purposes of Section 16.19. Seller and Buyer are each referred to as a "Party" and collectively referred to as the "Parties."

Date of Closing. Subject to the conditions stated in this Agreement, the sale by Seller and the purchase by Buyer of the Assets pursuant to this Agreement (the "Closing") shall occur on or before June 30, 2014, or on such date as Buyer and Seller may agree upon in writing. The date on which the Closing actually occurs shall be the "Closing Date."

Date of Closing from Purchase and Sale Agreement

This PURCHASE AND SALE AGREEMENT (this "Agreement") is executed as of this 1st day of June 2012, and is between Antero Resources Corporation, a Delaware corporation ("Seller") and Vanguard Permian, LLC, a Delaware limited liability company ("Buyer"). Seller and Buyer are each a "Party," and collectively the "Parties."

Date of Closing. Subject to the conditions stated in this Agreement, the sale by Seller and the purchase by Buyer of the Assets pursuant to this Agreement (the "Closing") shall occur on or before June 29, 2012, or if all conditions to Closing in Article VII have not yet been satisfied or waived by that date, then five (5) Business Days after such conditions have been satisfied or waived, or such other date as Buyer and Seller may agree upon in writing. The date Closing actually occurs shall be the "Closing Date".

Date of Closing from Purchase and Sale Agreement

This HEDGE PURCHASE AND SALE AGREEMENT (this Agreement) is executed as of this 14th day of October, 2011, and is between Vitruvian Exploration, LLC, a Delaware limited liability company (Seller), and GeoMet, Inc., a Delaware corporation (Buyer). Seller and Buyer are sometimes referred to herein each, individually, as a Party, and, collectively, as the Parties.

Date of Closing. Subject to the conditions stated in this Agreement, the consummation of the transactions contemplated by this Agreement (the Closing) shall occur on the day that the Oil and Gas Asset Purchase and Sale Agreement is consummated. The date of the Closing shall be the Closing Date.