80 GEOLOGICAL RELATIONS OF ALABAMA CLAYS. 



number 119. Analysis, number 214, shows the quality 

 of t'he purer and whiter variety. 



The clay deposits extend to within two or three feet 

 of the Devonian Black Shale, thus fixing the occur- 

 rence at the base of the Subcarboniferous formation. 



Beds of potter's clay of this formation have also 

 been noted at other localities, among them one in the 

 railroad cut just norith of Stevens' switch on the A. 

 G. S. R. E., and another in Calhoun county in S. 19, 

 T. 15, R. 6 E.* 



Hard white clay, like halloysite in appearance, has 

 also been noticed at points in it!he Tennesseee valley, 

 near Stevenson, and it is quite probable that search 

 in that valley would be rewarded by the finding of 

 deposits of the clay of commercial importance. 



COAL MEASURES. 



In some parts of the coal fields, the under clays of 

 the seams of coal have been utilized in the manufac- 

 tory of pottery, as at Jugtown, near Sterritt, in St. 

 Clair county; rt Font Payne and Rodentown, in De- 

 Kalb; at Vance's Station, in Tuscaloosa county; at 

 Summit, in Blount county, and at Arab, in Marshall 

 county. In all these places the clay is manufactured 

 into jugs, floweT* pots and similar articles, while at 

 Fort Payne it is also used in tlie manufacture of fire 

 brick. 



The shales of this formation are also utilized in 

 some parts of the State, notably at Coaldale, where 

 they are made into vitrified brick for paving purposes. 

 At the Graves Coal Mine, near Birmingham, occur 

 two bodies of shale, which have been analyzed and 



*Valley Regions, Part II., pages 4(1 and 741. 



