THK ANCIKNT PKUPLKS. ZD 



Material. The material employed in building aj)- 

 parently depended upon the ease with which stone 

 could be quarried. In the San Juan region, the sand- 

 stone was not difficult to work and on the Pajarito 

 Plateau the tufa was cut with ease. As a result, in 



■^•%e! 



Square Watch Tower, San Juan River. 

 (Courtesj- of Dr. Prudden.) 



both places the walls are mosth^ built of well-dressed 

 blocks of stone. In other localities the stone is in 

 thin strata and was broken off and dressed only enough 

 to make the surface of the walls even. The spaces 



