Spring House, A. D. 1115
Hemenway House, A. D. 1171
Balcony House, A. D. 1190-1272
Long House, A. D. 1204-11
Square Tower House, A. D. 1204-46
Spruce Tree House, A. D. 1230-74
New Fire House, A. D. 1259
Ruin No. 16, A. D. 1261
Buzzard House, A. D. 1273
Since considerable tree-ring material from these ruins remains yet to be examined, the dates given above are not final. On the basis of present evidence, Cliff Palace, the largest and most complex cliff house within the park, shows an occupancy of 200 years.