Moffitt Butte
Moffitt Butte is a dissected basaltic tuff ring, 4,600 feet (1,400 m) in diameter and 400 feet (122 m). Moffitt Butte is not associated with a lake basin, as is the case for Fort Rock and Hole-in-the-Ground, but rising magma probably encountered permeable aquifers beneath the cone. A line of tuff rings between Moffitt Butte and the Fort Rock-Christmas Lake Valley Basin are located roughly along what would have been an early drainage route between the Fort Rock Basin and the La Pine Basin. The crater floor of Moffitt Butte is about 260 feet (80 m) above the surrounding plain. A smaller vent and small tuff ring, 1,700 feet (520 m) in diameter, are located on Moffitt Butte's southwestern flank. The crater of the smaller vent is filled with lava that issued from a dike on its northwest edge.
Read more about this topic: Fort Rock Basin