136 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I47 



9 inches higher than that of Old Bonitian Room 86, next door, and 

 overlies a partially razed contemporary of 86, its floor 6 feet 4 inches 

 below (pi. 18, right). 



We observed foundations bearing second-type masonry under the 

 floors of Rooms 88 and 90 but other foundations had been so 

 thoroughly stripped of useful building stones the means of positive 

 identification has been lost. From the unnumbered room next north 

 of 86 Late Bonitian architects built a new outside wall of third-type 

 masonry, digressing widely from an earlier one that followed the 

 external curve of Old Bonito (fig. 4). Remnants of that earlier wall 

 survive subfloor, as noted above, and still other under-floor remnants 

 evidence further changes of plan before that for the third-type ad- 

 dition was finally adopted. Later, still another outside wall, the third, 

 was erected by the Late Bonitians (fig. 6.) 



Third-type masonry replaced much of that previously built through- 

 out this northern section (pis. 30, upper; 22, lower). It replaced 

 second-type masonry in the unnumbered room north of 296 (pi. 29, 

 left) and in others to the east of it: first, second, and third stories. 

 It replaced second-type masonry in Kiva G (pi. 68, left) and 

 throughout that rectangular, 14-room block that stands forth so 

 boldly on the east side of the village (fig. 5). Third-type masonry 

 that rarely equals our ideal (pi. 27, right) but utilizes building 

 blocks reclaimed from such walls makes up a large proportion of the 

 second addition, as planned and built by Late Bonitian architects. 

 This second addition developed out of the Late Bonitians' first addi- 

 tion but its reuse of materials prepared for the first accounts for the 

 resemblance between the two and often makes it difficult to distinguish 

 one from the other, as stressed in the previous chapter. 



Coupled with the disclosures of our West Court exploratory trench 

 and its extension (figs. 7, 14), two other cross-sections. A- A' and 

 C-C, contribute to knowledge of Pueblo Bonito history. Each cuts 

 through the entire village, from one exterior to the other ; each passes 

 through rooms of our four masonry types and graphically illustrates 

 their relationship. 



Cross-section A-A' (fig. 13) pictures the growth of Pueblo Bonito 

 from west to east. Rooms 320, 326, and 330 are of first-type 

 stonework and terminate the west wing of crescentic Old Bonito. 

 Adjoining 320 on the west is one of 3 unexcavated and unnumbered 

 houses erected by the Late Bonitians when they first came to dwell 

 in Chaco Canyon. Floor level in that unexcavated second-type house 

 is an estimated 3 feet 10 inches below that of third-type Rooms 117 



