376 CLAYS AND CLAY INDUSTRY. 



BURLINGTON COUNTY. 



This county extends from the Delaware river, between Bor- 

 dentown and Palmyra, to the Atlantic coast, between Tuckerton 

 and New Gretna. It is thus roughly triangular in form, and 

 since it stretches across the State, it includes portions of a number 

 of different formations, and consequently produces probably a 

 greater variety of clays than any other county of southern New 

 Jersey. The clay-bearing formations in Burlington county in- 

 clude the Raritan, Clay Marl I, Clay Marl II, Clay Marl III, 

 Cohansey, Cape May, and Pleistocene, other than Cape May. 



Raritan Clays. 



The Raritan clays outcrop and are dug chiefly along the Dela- 

 ware river, although smaller banks are found on Assiscunk creek. 

 The banks show three different classes of clay, viz., buff-burning 

 semirefractory clays, red-burning clays, and common-brick clays. 



Bridgeboro. — Of the first type, the most northern occurs just 

 southeast of Bridgeboro (Loc. 132) along Rancocas creek, where 

 a series of pits have been opened by the J. W. Paxson Company, 

 of Philadelphia. The general character of the clay in the main 

 bank is shown by the following section from top downward. 



Section at J. IV. Paxson Company's Pits. 



Pebbly sand, 8 to 10 ft. 



Reddish-mottled clay, 6 to 8 ft. 



Red sandy clay, 1 to 2 ft. 



Light-blue and white-mottled clay, 2 ft. or more 



The reddish-mottled clay is used for foundry purposes, and is 

 also sent to- Moorestown for terra-cotta manufacture. In some 

 of the opening-s larger quantities of the light-colored or so-called 

 white clay are found, but in others a black lignitic sand occurs at 

 the same level, this change representing the horizontal variations 

 that are not uncommon in the Raritan deposits, particularly along 



