CLAYS OF CRETACEOUS FORMATION. 189 



Just north of Keasbey Station, however, the fire clay rises to 

 about sea level, and is reached in the lowest pits of the Interna- 

 tional Clay Company (48, 49). In Goodrich's bank (51), Os- 

 trander's bank (53, 54), R. N. & H. Valentine's (55, 86), and 

 also D. A. Brown's (8y) at Sand Hills, the fire clay is well above 

 sea level and is extensively dug'. Nearer Bonhamtown the very 

 base of the Woodbridge fire clay is shown in a small opening on 

 the hillside over J. Pfeiffer's bank (90), but the greater part of 

 the hill above is of Pensauken gravel. A number of shallow pits 

 between Brown's bank and Pfeiffer's are in the weathered basal 

 portion of the fire clay. South of Bonhamtown are the banks of 

 Charles Edgar (94, 98), and the Raritan Ridge Clay Company, 

 formerly Augustine Campbell (99) . A fire clay is dug at the for- 

 mer, but at Campbell's banks a terra-cotta clay is found in the 

 same stratigraphical position as the fire clay, so that there seems 

 here to be a marked local variation in the quality of the clay. 

 Campbell has, however, recently opened a new bank in the fire clay 

 on the north side of the ridge near Bonhamtown. 



South of the Raritan river the fire-clay bed lies far below sea 

 level in the Sayreville area, and only the black laminated clays 

 are dug, but a white clay, probably the fire clay, was penetrated in a 

 boring at Furman's brickyard 35 feet below sea level. 1 



North of South River village, the fire clay occurs in the lowest 

 pits of the N. A. Pyrogranite Company (245), and of the Na- 

 tional Clay Manufacturing Company (244). Between Milltown 

 and South River, M. A. Edgar (232, 252), the Sayre & Fisher 

 Company (233, 237, 259), and the American Enamel Brick and 

 Tile Company (256), have opened the Woodbridge clay bed at 

 the horizon of the fire clay, but the clay is reported not to be so 

 refractory as that of the same bed farther east, a sample from 

 the American Enamel Brick and Tile Company's bank melting to a 

 glass at cone 30, whereas the No. 1 fire clay of the banks near 

 Woodbridge do- not melt under cone 35. In addition to these local- 

 ities where this bed has been opened, a white and red-mottled 

 clay, said to be 20 feet thick, outcrops along the road southeast of 

 Hoey's schoolhouse, on the property of George Hardenberg. Its 



1 Cook & Smock, loc. cit., 1878, p. 183. 



