CLAYS OF NEW YORK 627 



those of the timber belt and the Fayette formations, while fire 

 clays occur in the timber belt beds in Fayette, Henderson, and 

 Limestone co., and in the Fayette in Fayette co., but the last run 

 rather high in impurities. 



The occurrence of clays is mentioned from various localities in 

 the report on Grimes, Brazos, and Robertson co. 4th ann. rept. 

 Tex. geol. sur. 



Virginia 



Brick clays are extensively worked in the vicinity of Wash- 

 ington, kaolin is said to occur in Augusta, Wythe, and Cumber- 

 land CO., while there is the usual abundance of residual clays 

 in those portions of the state not covered by Cretaceous and 

 Tertiary deposits. 



^Yyoming^ 



All the clays of Wyoming that have any commercial importance 

 occur in the sedimentary beds of the Jurassic and Cretaceous for- 

 mations, but are also found to some extent in the Tertiary. The 

 formations containing these clays are found flanking nearly all the 

 mountain ranges in the state. But with the exception of their 

 being used for the manufacture of common brick in a few locali- 

 ties, very little development has occurred. All. the fire clay prod- 

 ucts now used in Wyoming are manufactured in Colorado; pressed 

 brick are also shipped into the state from various points. 



The loess is utilized at a number of places in Wyoming. 



1 W. C. Knight. E. and M. jour. Nov. 1898. 



