MARYLAND GEOLOGICAL SURVEY 209 



that it could be used in the manufacture of structural material if a 

 buff color were desired. An analysis of this clay is given below: 



Analysis of Stoneware Clay, Carpenter Point, Cecil County. 



Silica 72.50 



Alumina 17.00 



Ferric oxide 1 . 50 



Lime .35 



Magnesia .60 



Alkalies 1.10 



Ignition . 6.50 



Total 99.55 



Total fluxes 3.55 



A third deposit of importance occurs on the property of Mr. 

 Charles Simpress about \ mile south of Eder. The exposures show 

 three types of clay. The first, which is found at the bottom of the 

 pit, is a fire-clay, which is sent to Cowden's brick works at Northeast 

 for the manufacture of stove-brick. The second is a white fire-clay 

 of good refractoriness which is mixed with the third and sent to R. 

 Remey and Son, of Philadelphia, for the manufacture of stoneware. 

 This third clay which contains considerable organic matter that 

 passes off on burning is one of very fair refractoriness and would no 

 doubt find application as an ingredient of a stoneware or terra cotta 

 mixture. It could also be used in the manufacture of refractory 

 wares. 



Stoneware clays occur at many places on Elk Neck and often are 

 so situated as to facilitate shipment of the raw material or finished 

 products by water. At Bull Mountain there is an important bed of 

 dark plastic clay which forms a bluff 30 feet high with about 10 feet 

 of overburden to the first bed. This clay slakes rather slowly, 

 yielding a mass of very good plasticity and average tensile strength 

 of 123 pounds per square inch when air-dried. It is perhaps better 

 adapted to the manufacture of structural materials, terra cotta, or 

 floor tiles than high-grade stoneware. At the northern base of Bull 

 Mountain the stripping is as much as 30 or 40 feet, and here the 

 working of the material would be unprofitable unless some use could 

 be found for the overburden. Other stoneware clays are found near 



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