CLAYS OF GLOUCESTER COUNTY. 419 



GLOUCESTER COUNTY. 



Gloucester county includes the following clay-bearing forma- 

 tions: Raritan, Clay Marl I, Clay Marl II, Clay Marl III, the 

 Alloway and probably the Cohansey. The first four are found 

 in the northwestern part of the county, the Alloway clay in Har- 

 rison and South Harrison townships, and lenses of Cohansey clay, 

 if present, are to be looked for in the pines in the southeastern part 

 of the county. 



Raritan Clays. 



BiUingsport. — Dr. Cook 1 reported the occurrence of clay on 

 property of B. A. Lodge, 1%. miles south of BiUingsport. The 

 opening in the river bluff showed : 



Section near BiUingsport. 



Sand and gravel, 10-17 feet. 



Yellow clay, 2 feet. 



Potters clay, 10-12 feet. 



Yellow clay, 1 foot. 



White gravel, 



The clay was dark-colored, and carried lignite near the top of 

 the bed. Towards the bottom there was a little pyrite. The best 

 clay was quite sandy and had the following composition : 



Chemical analysis of clay. B. A. Lodge, BiUingsport. 



Sand, 56.00 



Silica (Si0 2 ), 16.20 



Alumina (A1 2 3 ) and Titanium oxide (Ti0 2 ), 1500 



Ferric oxide (Fe 2 3 ) , 1.20 



Lime (CaO), •. 



Magnesia (MgO), 0.32 



Potash (K 2 0), 1.68 



Soda (Na 2 0), 0.39 



Water (H 2 0), 7.70 



Moisture, 1.10 



Total, 99.59 



Report on Clays, 1878, p. 251. 



