140 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I47 



Amsden and Roberts classified 16 percent as Old Bonitian and 67.3 

 percent as later. 



Twenty-two inches under the floor of Kiva L, we came upon the 

 floor and partly razed bench of a second-type kiva, one of those con- 

 structed by the Late Bonitians as a feature of their initial building 

 program. Three years later, on July 29, 1926, the ventilator shaft 

 of that razed subfloor kiva appeared during our East Court trenching 

 operations south of Kiva L. Other structures of the same general 

 period, or portions of such structures, were encountered nearby 

 (fig. 4). 



Just beyond these broken remains, section C-C crosses the third- 

 type wall that divides the East Court but unfortunately misses two 

 important features, Room 190 the "heart" of Pueblo Bonito, and that 

 partially razed, second-type kiva, 12 feet deep, that occupies a con- 

 siderable portion of the Court south of the dividing wall. 



Our explorations in Room 150 revealed no less than five subfloor 

 foundations some of which continue eastward to connect with those 

 under the East Court while others extend on various levels west 

 under Room 218 or south and under 221. Despite limited resemblances 

 to one masonry type or another all these underfloor wall fragments are 

 judged to pre-date both Kiva A and Kiva B. 



Room 141, on the south middle front, is one of three shielding 

 Kiva B. That they are older than B is at least suggested by the fact 

 their presence forced the kiva ventilator shaft out of its normal 

 position and around to the east side. Over the wall, at the west end 

 of Room 153, a 1921 pit to a silt surface 9| feet below floor level 

 revealed Old Bonitian rubbish throughout. There were no late types 

 among the 789 potsherds recovered. Quite obviously here was an 

 outlying portion of the vast rubbish pile under the West Court that 

 Roberts and Amsden examined four years later. It is possible, also, 

 that Old Bonito was built on a slight elevation since the present sur- 

 face outside Room 141 is 8 feet lower than that outside Room 189. 



Room 141 and those on either side stood upon the north bank of a 

 floodwater channel to which the rincon back of Chettro Kettle surely 

 contributed — a channel that began upcanyon, continued past Pueblo 

 Bonito and Pueblo del Arroyo, and on down valley. So far as we 

 may judge, the Old Bonitians were not especially concerned with that 

 channel but the Late Bonitians sought year after year to change its 

 course and force its flood waters farther from their gateway. 



Beyond Room 141 our line leaps the old channel, climbs the slope 

 of the West Mound, bisects our 1925 trench diagonally, and continues 



