RESERVOIR GROUP, named by J. Ward Emerson, 34 RESERVOIRS, INDIAN— crossed by Old Bluff Road, 45 natural and artificial, 64 ROAD CANYON, formerly called the Wickyup, 57 ROOMS, with megalithic walls, 15 RUIN 3, description of, 48 RUIN 4, description of, 49 RUIN 5, description of, 49 RUIN 6, description of, 49 RUIN 7. _See_ ERODED BOWLDER HOUSE. RUIN 8. _See_ TWIN TOWERS. RUIN 9, description of, 50 RUIN 10. _See_ UNIT TYPE HOUSE. RUIN 11. _See_ STRONGHOLD HOUSE. RUIN CANYON— duplication of name misleading, 45 ruin in, 30 unit type houses of, 40 RUINS— classification of, 14 evidences of age of, 73 SAND CANYON— cliff-dwellings in, 38 scaffold in, 38 tower in, 57 SCAFFOLD FOR LOOKOUT, 38 SEMICIRCULAR RUINS, description of, 22 SLAB INCLOSURES— described by Jackson, 62 described by Holmes, 62 SLAB STRUCTURES— box-like, 60 circular, 60 pottery found near, 61 theories concerning, 61 “SMALL HOUSE” TYPE OF ARCHITECTURE, 70 SOCIAL ORGANIZATION, relation between architecture and, 75 “SPANISH TRAIL.” _See_ OLD SPANISH TRAIL. SQUARE TOWER CANYON— classification of ruins in, 46 directions for reaching, 45 map of, 45 new name for Ruin Canyon, 45 SQUAW POINT RUIN, described, 28 STONE ARCH HOUSE, location of, 38 STRONGHOLD HOUSE, description of, 52 SUN DIAL PALACE, named by J. Ward Emerson, 34 SUN TEMPLE— discovery of, 10 evidence of age of, 73 possible use of, 76 unique ground plan of, 42 SUROUARO— description of, 16 named by Newberry, 12 signification of name, 17 TOWERS— D-shaped, 44 date of construction undetermined, 43 entrance to, 42 entrance walled up, 57 forms of, 43 of Holly Canyon, 52 of McLean Basin, 56 of Mancos region, 58 of Sand Canyon, 57 of Wickyup Canyon, 57 possible use of, 42 structural features of, 40 windows absent in, 42 TOWERS AND GREAT HOUSES— form and construction of, 15 situation of, 15 “TRIPLE-WALLED TOWER”— at Mud Spring Ruin, 20 condition of, in 1881, 21 visited by Holmes, 11 TWIN TOWERS— description of, 50 ground plan of, 50 UNIT TYPE— defined, 16, 39 described by Prudden, 12 origin of, 72 unlike small house of Little Colorado, 70 UNIT TYPE HOUSE— description of, 50 ground plan of, 51 UNIT TYPE HOUSES— in cave, 39 in Hackberry Canyon, 40 “UPPER HOUSE” of Aztec Spring Ruin, 25, 26, 27 VILLAGES— defined, 16 essential features of, 14, 16 WEAPONS, iron, 68 WICKYUP CANYON— description of, 57 towers in, 57 WOLLEY RANCH RUIN, description of, 22 WOOD CANYON RUINS, description of, 32