POTTERY OR STONEWARE CLAYS. 163 



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



Silica 57.00j< 



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 accouats for its easy 

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

 haps be as a natural glaze. It is exceedingly finegrained. 

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

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

 parent glaze. 



CHALK BLUFF, ELMORE COUNTY. 



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

 The section involves approximately : 



Section at Chalk Bluff, Blmore 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, ELMOEB CO. 



This is a reddish gray fine grained clay, containing; 

 much fine mica and also an abundance ai organic matter. 

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



