Diamond Craters is a monogenetic volcanic field in southeast
Oregon. The volcanoes are all Quaternary in age. Lava flows and
tephra from the volcanoes cover an area of about 23 square miles
(60 square km). This photo shows Keyhole Crater. Special thanks
to Rosemary Kenney. Diamond Craters includes numerous features
associated with basaltic volcanism including cones, explosion
and collapse craters, fissures, and grabens. This photo shows
the cone and pit crater of Lava Pit. Little Red Cone is a cinder
cone in the Diamond Craters volcanic field. Diamond Craters is
about 60 miles (100 km) south-southeast of Burns, Oregon. All
photos courtesy of the Oregon Department of Geology and Mineral
Industries. Sources of Information: Peterson, N.V., and Groh,
E.A., 1964, Diamond Craters, Oregon: Ore Bin (Oregon Geology),
v. 39, p. 125-140. Russell, J.K., and Nicholls, J., 1987, Early
crystallization history of alkali olivine basalts, Diamond
Craters, Oregon: Geochim. Cosmochim. Acta, v. 51, p. 143-154.
Simkin, T., and Sie