Exhibit 4
JOINT FILING AGREEMENT
The undersigned reporting persons hereby agree that the statements filed
pursuant to this Schedule 13D, dated April 10, 2001, to which this Agreement is
filed as an exhibit, are filed on behalf of each of them.
Date: April 10, 2001 PURE RESOURCES, INC.
By: /s/ XXXX XXXXXXXXX
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Name: Xxxx Xxxxxxxxx
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Title: President
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Date: April 10, 2001 PURE RESOURCES II, INC.
By: /s/ XXXX XXXXXXXXX
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Name: Xxxx Xxxxxxxxx
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Title: President
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Date: April 10, 2001 TITAN EXPLORATION, INC.
By: /s/ XXXX XXXXXXXXX
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Name: Xxxx Xxxxxxxxx
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Title: President
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Date: April 10, 2001 UNOCAL CORPORATION
By: /s/ XXXXXXX X. XXXXXX
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Name: Xxxxxxx X. Xxxxxx
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Title: Vice President, Corporate Development
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Date: April 10, 0000 XXXXX XXX XXXXXXX XX XXXXXXXXXX
By: /s/ XXXXXXX X. XXXXXX
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Name: Xxxxxxx X. Xxxxxx
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Title: Vice President, Corporate Development
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