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EXHIBIT 99.1
JOINT FILING AGREEMENT
The parties hereto agree that pursuant to Rule 13d-1(k)(1)(iii) of
Regulation 13D promulgated by the Securities and Exchange Commission pursuant to
the Securities Exchange Act of 1934, as amended, the Schedule 13D of which this
Agreement is made an exhibit is filed on behalf of them in the capacity set
forth below.
Date: August 23, 1999 NATURAL GAS PARTNERS II, L.P.
By: G.F.W. Energy II, L.P.,
its Sole General Partner
By: GFW II, L.L.C.,
its Sole General Partner
By: /s/ XXXXXXX X. XXXXX
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Xxxxxxx X. Xxxxx
Authorized Member
Date: August 23, 1999 G.F.W. ENERGY II, L.P.
By: GFW II, L.L.C.,
its Sole General Partner
By: /s/ XXXXXXX X. XXXXX
--------------------------------------
Xxxxxxx X. Xxxxx
Authorized Member
Date: August 23, 1999 GFW II, L.L.C.
By: /s/ XXXXXXX X. XXXXX
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Xxxxxxx X. Xxxxx
Authorized Member
