POTTERY OR STONEWARE CLAYS. 163 



Analysis of Pottery Clay, Rock Run, Cherokee Co. (No. 192). 



Silica 57.00* 



Alumina 17.80 



Ferric oxide 5.60 



Lime 2.10 



Magnesia 1.20 



Alkalies 6.00 



Ignition 9.45 



99.15 

 Total 14.90 



The high percentage of fluxes accounts for its easy 

 fusibility, and the best use for this material would per- 

 haps be as a natural glaze. It is exceedingly fine grained. 

 When a slip is made of it and No. 205 (clay from near 

 Kyrnulga) dipped into it, at cone 3-4 it yielded a trans- 

 parent glaze. 



' CHALK BLUFF, ELMOKE COUNTY. 



At this locality there is a high bluff of clay and sand. 

 The section involves approximately : 



Section at Chalk Bluff, Elmore Co. 



Sand 6 feet 



Yellow clay 4 feet 



Dark sandy clay 12 feet 



Plastic clay 10 feet 



Both the dark sandy, and lower plastic clay were tested 

 and yielded very promising results. The lower bed yields 

 a stoneware clay, and the upper a brick clay. (See Nos. 

 101 and 122.) " 



(No. 101.) 

 STONEWARE CLAY. 



CHALK BLUFF, ELMORE CO. 



This is a reddish gray fine grained clay, containing 

 much fine mica and also an abundance al ( rganic matter. 

 In water it slakes very slowly. The addition of 38 per 



