220 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I47 



tially razed and buried wall of excellent second-type construction, 

 23 inches thick (fig. 24, c above Stations 85-105). 



We lengthened our test pit to expose more of this wall and found 

 a neat corner 20 feet from the inner north side of the enclosure (pi. 

 79, left). The wall had been built upon a compact adobe surface 

 that dips west 10 or 12 inches in our 5-foot-wide trench, but con- 

 tinues southward above the diversified fill of a former broad water- 

 course. When razing the corner the Bonitian demolition crew al- 

 lowed more waste to fall inside the angle than out. 



THE EAST MOUND TRENCH 



In 1925 we extended this East Mound Trench in both directions, 

 south to Bryan's "post-Bonito channel" (Bryan, 1954, pp. 33-36) and 

 north to the foundations of Room 171 (fig. 24, c). Between mound 

 and ruin the trench averaged 10 or 11 feet deep and was irregularly 

 floored with clay-streaked, stratified sand. This water-laid deposit 

 at once identified itself as part of the same east- west watercourse 

 profiled by the West Mound Trench. Here, as there, the former 

 channel had become a common dumping place at an early date and 

 gradually was filled with occupational debris from Bonitian dwell- 

 ings and with waste from razed walls. Some of this channel-fill 

 extended north beneath the ruin and south beneath the mound. 

 Throughout, from bottom to top, successive layers of silt and wind- 

 blown sand remain to evidence the passing years. 



Ten feet below the original surface and beneath a curious body of 

 compact, sandy clay interspersed with clay pellets, occasional pot- 

 sherds and sandstone spalls, we came upon a shallow, ash-filled 

 hearth (Station 125, fig. 24, c). It was larger and more conspicuous 

 than the hearth we bisected above Station 160, West Mound Trench, 

 but, like the latter, had been built on dry, stratified sand for limited 

 use. 



Our East Mound Trench ended against the south wall of Room 

 171, the foundation of which rests 4 feet below the apparent surface 

 at time of abandonment. A layer of constructional waste immediately 

 beneath the foundation extends southward a short distance and then 

 is buried under a greater quantity of occupational refuse. A foot 

 lower, or 8 feet below the probable original surface, our trench-end 

 halved a second, clay-lined ash-filled hearth, this one measuring 34 

 inches wide by 4 inches deep (pi. 79, right). 



Silt-streaked, water-laid sand spread out beneath the hearth ; debris 

 of demolition, above. A dozen feet to the south against the eroded 



