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Aplite dikes on one of the higher spurs in the northwestern part of the Little Ajo Mountains. Pima County, Arizona. 1932. Form a panorama; aplite dikes on one of the higher spurs in the northwestern part of the Little Ajo Mountains, viewed from the west. The smooth hill slopes ate equigranular Cornelia quartz monzonite. The craggy outcrops are aplite, commonly with blending contacts against the coarser grained rock. The dikes dip steeply to the left (north). Pima County, Arizona. 1932. Plate 1-D, in U.S.Geological Survey Professional paper 209. 1946. Categories: Image; Tags: Aplite, Cornelia quartz monzonite, Pima County, Arizona, photo print Aplite dikes on one of the higher spurs in the northwestern part of the Little Ajo Mountains. Pima County, Arizona. 1932. Form a panorama; aplite dikes on one of the higher spurs in the northwestern part of the Little Ajo Mountains, viewed from the west. The smooth hill slopes ate equigranular Cornelia quartz monzonite. The craggy outcrops are aplite, commonly with blending contacts against the coarser grained rock. The dikes dip steeply to the left (north). Pima County, Arizona. 1932. Plate 1-D, in U.S.Geological Survey Professional paper 209. 1946. Categories: Image; Tags: Aplite, Monzonite, Pima County, Arizona, photo print