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Black Mountain from the northeast; composed of Batamote andesite. Note steep debris slopes below the cliffs and the uneven topography at the base in contrast with the smooth pediment carved on quartz monzonite, shown in photo 63. Pima County, Arizona. 1932. Plate 1-C, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Contorted injection gneiss of Cardigan gneiss, shows intimate contortions; coin is 2 centimeters in diameter, one mile northwest of Cardigan. Pima County, Arizona. 1932. Plate 4-C, in U.S.Geological Survey Professional paper 209. 1946.
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Ptygmatic folding in dark faces of Cardigan gneiss, shear surfaces with cataclastic structures (later than the folding) stand horizontally. The coin is 2 centimeters in diameter. Copper Canyon. Pima County, Arizona. 1932. Plate 4-D, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Refoliated gneiss: Older foliation brought out by broader light bands (in obscure dark material above hammer) that trend upward and to the left. This is cut and displaced by the horizontal gneissic banding to the left of the hammer, which shows suggestions of displacement of upper layers to the left with respect to the lower layers and cuts them into lenses. This is crystalloblastic cataclastic metamorphism superposed on older crystalloblastic structures. Hammer head is about 8 inches long; one mile north of Chico Shunie village. Pima County, Arizona. 1932. Plate 5-E, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Quartz diorite injections transecting banding of contorted gneiss. The bands are also of quartz diorite and closely resemble the wider dike petrographically. Dark facies of the Cardigan forms the matrix. Coin is 2 centimeters in diameter; one mile north of Cardigan. Pima County, Arizona. 1932. Plate 5-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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West from Ajo Peak, hogback ridges in the foreground, light colored western hills of the Little Ajos in the middle ground, and Growler Mountains on the sky line. The hogbacks are Locomotive fanglomerate capped by Ajo volcanics. The lighter hills are Chico Shunie quartz monzonite, with Cardigan gneiss on the lower right hand slopes; pediment along Chico Shunie Arroyo at extreme left middle ground. Pima County, Arizona. 1932. Plate 1-A, in U.S.Geological Survey Professional paper 209. 1946.
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Refoliated (polymetamorphic) gneiss: Note the older gneissic banding (with some swells probably due to replacement) cut by and dragged along the new shear surfaces trending from lower left to upper right. "Umfaltungsclivage." one mile north of Chico Shunie village. Pima County, Arizona. 1932. Plate 5-D, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Contact between dark facies of Cardigan gneiss and lighter quartz diorite bands. Note the round feldspar in the light band at the bottom, the coarser angular feldspar in the intermediate layer, and the dark facies with discontinuous wider quartz-feldspar bands in the upper part. Some of the feldspar, especially in the middle band is probably due to replacement rather than injection. Block is about 1 foot high. Pima County, Arizona. 1932. Plate 5-C, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Form a panorama from 2,172 foot hill southwest of Black Mountain. Extreme left is west; shows pediment and alluvial slope in foreground, hill of Cardigan gneiss and Daniels conglomerate overlain by Batamote andesite in middle ground, Growler Mountains on sky line at left. Butte in left center is of Batamote andesite. Pinnacles in left center are Ajo Peaks, with the main mass of the Little Ajos on the sky line to their right. Black Mountain on right center. The ragged hills in the foreground leading toward Black Mountain are of Childs latite. Valley of the Ajo on right: Pozo Redondo Mountains at extreme right. Pima County, Arizona. 1932. Plate 2-A, in U.S.Geological Survey Professional paper 209. 1946.
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Contorted injection gneiss of the Cardigan gneiss. Irregular veins of light quartz diorite gneiss in darker quartz diorite gneiss; pocket knife is 3.5 inches long; near Cardigan. Pima County, Arizona. 1932. Plate 4-B, in U.S.Geological Survey Professional paper 209. 1946.