Trans-Pecos Texas Ranges | Level 4 (Parent) |
         El Paso Ranges | Level 5 (Sibling) |
         Van Horn Area | Level 5 (Sibling) |
         Presidio County Area | Level 5 |
                 Sierra Vieja | Level 6 (Child) |
                 Cuesta del Burro Mountains | Level 6 (Child) |
                 Chinati Mountains | Level 6 (Child) |
         Guadalupe Mountains | Level 5 (Sibling) |
         Delaware Mountains | Level 5 (Sibling) |
         Davis Mountains | Level 5 (Sibling) |
         Glass Mountains | Level 5 (Sibling) |
         Big Bend Ranges | Level 5 (Sibling) |