----

----

|   | SELLER: | LINN      ENERGY HOLDINGS, LLC. |
|--------|---------|---------------------------------|

|   | /s/      Mark E.      Ellis                                                                   Mark      E. Ellis |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | President      and Chief Operating Officer |
|--------|--------------------------------------------|

|   | SELLER: | MARATHON      85-II LIMITED PARTNERSHIP a West Virginia limited    partnership |
|--------|---------|--------------------------------------------------------------------------------|

|   | By:   Linn      Energy Holdings, LLC, GeneralPartner |
|--------|---------------------------------------------------------------------|

|   | /s/      Mark E.      Ellis                                                                   Mark      E. Ellis |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | President      and Chief Operating Officer |
|--------|--------------------------------------------|

|   | SELLER: | MARATHON      85-III LIMITED PARTNERSHIP a West Virginia limited    partnership |
|--------|---------|---------------------------------------------------------------------------------|

|   | By:   Linn      Energy Holdings, LLC, GeneralPartner |
|--------|---------------------------------------------------------------------|

|   | /s/      Mark E.      Ellis                                                                   Mark      E. Ellis |
|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | President      and Chief Operating Officer |
|--------|--------------------------------------------|

|   | BUYER: | XTO      ENERGY INC. |
|--------|--------|----------------------|

|   | /s/      Vaughn O. Vennerberg,      II                                            Vaughn      O. Vennerberg, II |
|--------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | Senior      Executive Vice President & Chief ofStaff |
|--------|----------------------------------------------------------|