CLAYS OF NEW YOKK 615 



The brick clajs are of course found at many localities and are 

 most extensive at Jacksonville. 



Fullers' earth was first discovered at Quincy, Ela.; it lias been 

 mined more at that point than at any other, but it is known to occur 

 at several localities between Quincy and River Junction, as well as 

 outcrop at several places around Tampa bay. 



Georgia 



Building brick are made at many localities, either from alluvial 

 clays found in the river valleys or from residual clays which occur 

 everywhere in the area underlain by the crystalline rocks. 



Kaolin, sometimes of a pure white color, occurs in pockets in the 

 residual earths of the Knox dolomite, while clays resulting from the 

 decay of the Paleozoic rocks are also common, but many of them 

 are easily fused. (J. W. Spencer. Report on the Paleozoic forma- 

 tions of Georgia J 1893) According to Prof. Spencer, the most 

 extensive clay deposits occur along the northern belts of the Ter- 

 tiary strata in the southern part of the state. 



The Potomac formation specially contains many clays of a white 

 or nearly white color, which are often of a very high refractory 

 quality. (G. E. Ladd. American geologist. Ap. 1899. p. 240) 



Indiana 



In resent years two important contributions bearing on the clay 

 resources of Indiana have been published by the present state 

 geologist. {See 20th and 22d ann. repH Ind. geol. sur.) 



In speaking of the Indiana clays in general, it can be said that 

 there are 



1 Residual clays, viz, a) rock kaolins of Lawrence and adjoin- 

 ing counties, h) surface clays of the driftless area of southern 

 Indiana 



2 Sedimentary clays including a) shales and fire clays of Paleo- 



