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Excavation in Peorian and Bignell loesses in bluffs near center sec. 30, T.75N., R. 43 W., Council Bluffs. Note humic layer above first terrace level from bottom. Pottawattamie County, Iowa. May 1960.
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Capulin Volcano National Monument, New Mexico. Capulin Mountain, a huge cinder cone which erupted between 4,000 and 10,000 years ago, rises more than 1,000 feet above its base. Photo by R.D. Miller. Figure 12, U.S. Geological Survey Bulletin 1493.