Common use of BASE CONTRACT FOR THE SALE AND PURCHASE OF NATURAL GAS Clause in Contracts

BASE CONTRACT FOR THE SALE AND PURCHASE OF NATURAL GAS. This First Amendment To Base Contract For The Sale And Purchase Of Natural Gas (this "Amendment") is made and entered into on November ___, 2005 (the “Effective Date”) by and between Atlas America, Inc., a Pennsylvania corporation (“Atlas PA”), Atlas America, Inc. a Delaware corporation ("Atlas DE"), and UGI Energy Services, Inc. d/b/a/ GASMARK, a Pennsylvania corporation ("GASMARK"). This Amendment modifies, supplements, forms part of, and amends that certain Base Contract for the Sale and Purchase of Natural Gas entered into as of November 13, 2002 between GASMARK and Viking Resources Corporation and assigned by Viking Resources Corporation to Atlas PA by Assignment and Assumption Agreement dated October 1, 2004 (the "Base Contract"). Capitalized terms used in this Amendment that are not herein defined will have the meanings ascribed to them in the Base Contract. In the event of a conflict between the terms of this Amendment and the Base Contract, the terms of this Amendment shall apply. Atlas PA, Atlas DE and GASMARK are at times referred to herein individually as a "Party" and collectively as the "Parties."

BASE CONTRACT FOR THE SALE AND PURCHASE OF NATURAL GAS. This First Amendment To Base Contract For The Sale And Purchase Of Natural Gas (this "“Amendment"”) is made and entered into on November ___, 2005 (the “Effective Date”) by and between Atlas America, Inc., a Pennsylvania corporation (“Atlas PA”), Atlas America, Inc. a Delaware corporation ("“Atlas DE"”), and UGI Energy Services, Inc. d/b/a/ GASMARK, a Pennsylvania corporation ("“GASMARK"”). This Amendment modifies, supplements, forms part of, and amends that certain Base Contract for the Sale and Purchase of Natural Gas entered into as of November 13, 2002 between GASMARK and Viking Resources Corporation and assigned by Viking Resources Corporation to Atlas PA by Assignment and Assumption Agreement dated October 1, 2004 (the "“Base Contract"”). Capitalized terms used in this Amendment that are not herein defined will have the meanings ascribed to them in the Base Contract. In the event of a conflict between the terms of this Amendment and the Base Contract, the terms of this Amendment shall apply. Atlas PA, Atlas DE and GASMARK are at times referred to herein individually as a "“Party" ” and collectively as the "“Parties."”