LIST OF GROUP MEMBERS
The group members filing this Schedule 13G pursuant to Rule 13d-1(d) are:
Crosstex Energy Holdings Inc., a Delaware corporation;
Yorktown Energy Partners IV, L.P., a Delaware limited partnership;
Yorktown IV Company LLC, a Delaware limited liability company;
Yorktown Energy Partners V, L.P., a Delaware limited partnership; and
Yorktown V Company LLC, a Delaware limited liability company;