Characteristic ruin, of the Pueblo San Juan, New Mexico, on the north bank of the San Juan River, about 15 miles west of the mouth of Cañon Largo. The present race of Indians know nothing of when or by whom these buildings were constructed. The ruin is about 350 feet square, and built of natural stone, joined together by a mud cement, No. 43 from the series "Geographical Explorations and Surveys West of the 100th Meridian"