1937, he does not base his vii Vili Preface claim to whatever competence he may have for the present...courtesies, particularly those of the University of Arizona, the Southwest Museum, the Field Museum, and the...244 The Minnesota Man The Casa Grande Ruins, Arizona 273 274 Cliff Palace, Mesa Verde, Colorado Bung...water carrying iron oxide, pyrites, sulphur, malachite, magnesite, carbon. silica, or some other petrifying...formerly occupied. Wood from the Petrified Forest of Arizona is a splendid example. Whenever this process of |