EXHIBIT A
AGREEMENT CONCERNING JOINT FILING OF SCHEDULE 13D
The undersigned agree as follows:
(i) each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and
(ii) each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other person making the filing, unless such person knows or has reason to believe that such information is inaccurate.
Dated: November 22, 2011
| Lime Rock Resources A, L.P. | |||
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| By: | Lime Rock Resources A GP, LLC, its general partner | ||
| By: | Lime Rock Resources GP, L.P., its general partner | ||
| By: | LRR GP, LLC, its general partner | ||
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| By: | * | ||
| Name: | Jonathan C. Farber | ||
| Title: | Managing Member | ||
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| Lime Rock Resources B, L.P. | |||
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| By: | Lime Rock Resources GP, L.P., its general partner | ||
| By: | LRR GP, LLC, its general partner | ||
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| By: | * | ||
| Name: | Jonathan C. Farber | ||
| Title: | Managing Member | ||
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| Lime Rock Resources C, L.P. | |||
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| By: | Lime Rock Resources C GP, LLC, its general partner | ||
| By: | Lime Rock Resources GP, L.P., its general partner | ||
| By: | LRR GP, LLC, its general partner | ||
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| By: | * | ||
| Name: | Jonathan C. Farber | ||
| Title: | Managing Member | ||
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| * | |||
| Jonathan C. Farber | |||
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| John T. Reynolds | |||
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*By: | /s/ Kris Agarwal |
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| Kris Agarwal, as Attorney-in-Fact |
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