Round Butte, Oregon

Round Butte is a cinder cone that is on a shield volcano. Round Butte is in the Deschutes Basin about 5 miles (8 km) southwest of the town of Madras. Round Butte erupted about 3.97 million years ago. One lava flow from Round Butte entered the Deschutes River and formed pillow basalts. Photo courtesy of the Oregon Department of Geology and Mineral Industries.

Source of Information:

Morris-Bishop, E., Smith, G.A., 1990, A field guide to the geology of Cove Palisades State park and the Deschutes Basin in central Oregon: Oregon Geology, v. 52, no. 1, p. 3-16.

---

Images of Volcanoes To VolcanoWorld