Diamond Craters is a 60 sq km volcanic field in SE Oregon, 11 km east of highway 205 and 64 km (40 miles) southeast of the town of Burns. It consists of cinder cones, maars (explosion craters) and lava flows.
Diamond Craters were named after the Diamond Ranch, established in the area by the pioneer Mace McCoy and his partner Albert Hugh Robie. The ranch used a diamond-shaped brand, hence the name.
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