Global Volcanism Program | Image GVP-03019
Forked Butte, the cinder cone on the left skyline south of snow-capped Mount Jefferson, was formed about 6500 years ago. It produced blocky lava that flowed from the notch to the right of Forked Butte down valleys on both sides of Sugar Pine Ridge, which forms the right skyline. The southern lobe traveled 8 km to the west down Cabot Creek below Sugar Pine Ridge.
Photo by Lee Siebert, 1995 (Smithsonian Institution).