CLAYS OF CAMDEN COUNTY. 393 



Analysis of a white sand, H. Hylton, Palmyra. 



Silica, total (Si0 2 ), 91.80 



Alumina (AkOs), 5-6o 



Potash (K2O), 0.20 



Water (H a O) , 2.20 



99.80 



It was said to stand fire well and was used in the manufacture 

 of fire brick. 



Analysis of a fire clay, H. Hylton, Palmyra. 



Sand, 56.80 



Silica (Si0 2 ), 17-50 



Alumina (A1 2 3 ), and Titanium oxide (TiOj), 18.II 



Ferric Oxide (Fe^Oa), 1.09 



Lime (CaO), 0.11 



Magnesia (MgO), 



Potash (K2O), 0.76 



Soda (Na.O) , 0.20 



Water (H-O), 5-50 



Moisture, 0.40 



100.47 



This represents a very sandy clay and agrees rather closely 

 Avith the later analysis given above. 



The material was formerly sent to Trenton for fire brick, and 

 was also used for retorts and condensers in zinc furnaces. Its 

 chief use now is for foundry work. 



Not far to the west of Hylton' s pits, another bank has been 

 opened by P. Erato (PI. XXIII). It lies along the tracks of the 

 Amboy division of the Pennsylvania R. R., just northeast of Mor- 

 ris station (Loc. 139), and the excavation is primarily for sand 

 and gravel, but clay is found beneath. The amount of sand and 

 .gravel covering the clay in this bank ranges from 10 to 35 feet. 

 Two grades of clay are recognized, a No. 2, which forms the 

 upper portion of the bed, and a No. 1, or lower clay. The white 

 sand associated with the clay is used for fire sand, and the yellow 

 sand of the bank for molding purposes. A laboratory examina- 

 tion of the No. 2 clay (Lab. No. 631) showed it to' be a mottled 

 sandy clay with little mica. It slaked slowly but completely, and 



