106 THE CLIFF 
ABODE WALLS 
NAVAJO WALLS 
RUINS OF CANYON DE CHELLY [ETH. ANN. 16 
YY 
Yyy 
= GY 
Se oe 
a 
es 
k 
Yi 

Fig. 15—Ground plan of the upper part of Casa Blanca ruin. 
of plans of ruins, are of 
the highest importance. 
From them the sequence 
of construction canoften 
be determined. a 
The walls of the lower 
seured by loose débris, — 
of whichalargeamount 
is lying about. Roof 
débris is especially 
abundant; it consists of 
small twigs and lumps 
of clay, with ends of 
beams projecting here 
and there. The princi- 
pal walls oceur in the 
e 
astern part, where — 
some of them are 2 feet 
thick and still standing 
toa height of 10 and 12 
and in one place of 14 
feet. An inspection of 
the plan will show that, 
as is invariably the case’ 
where a wall rises to a 
height of more than one 
story, the lower part is 
assive and the upper 
wall sets back 5 or 6 
inches, reducing its 
thickness by that 
amount. <All the heavy 
walls occur either about 
the kiva or east of it. 
5 
Apparently these walls ; a 
were built first espe- 
cially heavy and mas-— 
sive, and afterward, 
when upper stories were 
added, it was not found 
necessary to carry them 
up the full thickness. 
It will be noticed that 
the wall extending east- 
ward from the corner of 
ruin are somewhat ob- : 



}, ae 
ae Zn 
Piri: 
Ht 
yt 
eA 
