YELLOW JACKET CANYON— formerly known as Hovenweep, 57 investigations in, 10 towers of, 54 ZUÑI CEREMONIAL ROOMS NOT TRUE KIVAS, 71 [Illustration: PLATE 1 a, BUTTE RUIN] [Illustration: b, AZTEC SPRING RUIN] [Illustration: c, SUROUARO, YELLOW JACKET SPRING RUIN (Photographs by Jacob Wirsula)] [Illustration: PLATE 2 a, BLANCHARD RUIN] [Illustration: b, BLANCHARD RUIN, MOUND 2] [Illustration: c, SUROUARO, YELLOW JACKET SPRING RUIN (Photographs by Jacob Wirsula)] [Illustration: PLATE 3 a, ACMEN RUIN (Photograph by T. G. Lemmon)] [Illustration: b, MUD SPRING RUIN (Photograph by Jacob Wirsula)] [Illustration: PLATE 4 a, BUILDING ON ROCK PINNACLE, NEAR STONE ARCH, SAND CANYON] [Illustration: b, STONE ARCH, SAND CANYON (Photographs by J. Walter Fewkes)] [Illustration: PLATE 5 a, TOWER IN SAND CANYON] [Illustration: b, UNIT TYPE HOUSE IN SAND CANYON (Photographs by T. G. Lemmon)] [Illustration: PLATE 6 a, STONE ARCH HOUSE, SAND CANYON] [Illustration: b, CLIFF-HOUSE, SHOWING BROKEN CORNER (Photographs by Jacob Wirsula)] [Illustration: PLATE 7 a, SCAFFOLD IN SAND CANYON] [Illustration: b, STORAGE CIST IN MANCOS VALLEY] [Illustration: c, PICTOGRAPHS NEAR UNIT TYPE HOUSE IN CAVE (Photographs by T. G. Lemmon)] [Illustration: PLATE 8 DOUBLE CLIFF-DWELLING, SAND CANYON (Photograph by T. G. Lemmon)] [Illustration: PLATE 9 a, CLIFF-DWELLING UNDER HORSESHOE RUIN] [Illustration: b, CLIFF-DWELLING, RUIN CANYON (Photographs by Jacob Wirsula)] [Illustration: PLATE 10 a, KIVA OF CLIFF RUIN, LOST CANYON] [Illustration: b, CLIFF RUIN, LOST CANYON (Photographs by Gordon Parker)] [Illustration: PLATE 11 a, SQUARE TOWER IN SQUARE TOWER CANYON] [Illustration: b, TOWER IN McLEAN BASIN] [Illustration: c, RUIN IN HILL CANYON, UTAH (Photographs by T. G. Lemmon)] [Illustration: PLATE 12 HEAD OF SOUTH FORK, SQUARE TOWER CANYON (Photograph by Geo. L. Beam. Courtesy of the Denver & Rio Grande Railroad)] [Illustration: PLATE 13 NORTH FORK OF SQUARE TOWER CANYON, LOOKING WEST a, Hovenweep Castle. b, Hovenweep House. c, Tower No. 9. d, Tower on point at junction of North and South Forks. e, Twin Towers. f, Unit type House (Photograph by Geo. L. Beam. Courtesy of the Denver & Rio Grande Railroad)] [Illustration: PLATE 14 a, HOVENWEEP HOUSE AND HOVENWEEP CASTLE, FROM THE SOUTH] [Illustration: b, HOVENWEEP CASTLE, FROM THE WEST] [Illustration: c, HOVENWEEP CASTLE, FROM THE SOUTH (Photographs by Jacob Wirsula)] [Illustration: PLATE 15 a, WEST END OF TWIN TOWER, SHOWING SMALL CLIFF-HOUSE (Photograph by J. Walter Fewkes)] [Illustration: b, TWIN TOWERS, SQUARE TOWER CANYON, FROM THE SOUTH (Photograph by Jacob Wirsula)] [Illustration: c, TOWER 4, JUNCTION OF NORTH AND SOUTH FORKS, SQUARE TOWER CANYON (Photograph by Jacob Wirsula)] [Illustration: PLATE 16 a, HOVENWEEP CASTLE, WITH SLEEPING UTE MOUNTAIN, SOUTH FORK, SQUARE TOWER CANYON] [Illustration: b, ENTRANCE TO SOUTH FORK, SQUARE TOWER CANYON