233 



Clays. 



Tbe residual clay derived from the breaking down of tlie Harrods- 

 burg limestone is very stiff and of a deep red color. The clay resulting 

 from the decomposition of the Knobstone shales is usually blue except 

 on weathered surfaces, where it is light yellow. All the other clays of 

 the region, those of the deltas being good examples, are yellow. 



The blue clay is derived from the blue stone and shale of the Knob- 

 stone. Only three patches of this clay were noticed, one north of Bean 

 Blossom Creek near the Brown County line, one just across Honey Creek 

 on the road east of Fleener, the other in the delta (bench) south of Muddy 

 Flat Creek, about a half mile south of Dolan. There are probably several 

 other patches of this clay in the area, but as my investigations did not 

 have reference to clays, no particular search was made for them. The 

 clay of the first two patches mentioned is residual, while that of the last 

 is probably stream wash and about 25 feet deep. On being burned in a 

 kiln it burns white. The foreman of the tile mill at Dolan states that it 

 is a good potter's clay. In burning tile the blue clay is mixed with equal 

 parts of the yellow clay. This mixture produces a tile of fair quality. 



Both the delta and bench formations in the Bean Blossom Valley are 

 yellow above and sometimes down to a depth of 20 feet. This clay is 

 the same in appearance as the yellow clay at Dolan that is made into 

 tile. It is the opinion of the writer that a large tile and brick industry 

 could be built up in this valley. 



Indiana University, December 31, 1903. 



Geology of the Fort Apache Region, Arizona. 



By Albert B. Reagan. 



(By title.) 



