National Geographic : 1928 Jun
THE NATIONAL GEOGRAPHIC MAGAZINE WHERE SOLID ROCK FLOWED LIKE WHEAT: THE OUTER SLOPES OF THE CRATER Hopi Indians regard Meteor Crater with superstitious awe. Members of the tribe come periodically to obtain the powdery white rock flour from the outer slopes for use in religious ceremonials. Rock flour consists of grains of sandstone pulverized by shock (see page 729). Photographs Courtesy U. S . Geological Survey THE TIIREE-MILE PATH AROUND THE INNER RIM LEADS OVER BROKEN ROCK Minute diamonds have been found in carbon pockets within the meteorites of Meteor Crater. Note the angle at which these rock strata have been propped up.