This blocky lava flow in the McKenzie Pass area of the central Oregon Cascades originated from Yapoah scoria cone on the north flank of North Sister about 2,600-2,900 years ago. The flow traveled 5 km to the north before being deflected by lava flows from the Belknap and Little Belknap shield volcanoes and then flowed an additional 8 km to the NE.

Photo by Lee Siebert, 1972 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: lava flow | scoria cone

Three Sisters