CLAYS OF CRETACEOUS FORMATION. 195 



Campbell at several pits south of Metuchen. In addition to these,- 

 it has been dug by Calvin Pardee (237), on the John Conger 

 farm (97), and by N. Lorensen (238), since the publication of 

 the 1878 Clay Report. In some of the pits mentioned in that re- 

 port, but long since abandoned, samples of the clay can still be 

 seen. In addition to these localities, where there is no< question as 

 to the stratigraphical position of the clay, a red-spotted, terra- 

 cotta clay has been dug by Joshua Little and George Cutter a 

 mile north of Fords and 2 miles southwest of Woodbridge. The 

 clay resembles very closely that of the Brinckman Terra Cotta 

 Company, so far as color and feeling goes, but the altitude of its 

 top in the two pits, 135 feet and 145 feet respectively, is much 

 greater than the Raritan potter's clay bed should have in this 

 vicinity, unless the underlying shale rises very rapidly at this 

 point. The clay was reported to> have a thickness of 37 feet, which 

 would make the altitude of its base 108 feet. In spite of the dis- 

 crepancy in elevation, this clay is tentatively referred to the 

 Raritan potter's clay. 



South of the Raritan river, and within the area shown on Plate 

 XI, the outcrop of this clay bed is a very narrow one, being limited 

 to a ribbon-like strip along the sides of Lawrence brook and its 

 tributaries. A black clay grading downward into a white clay, 

 and exposed to a depth of 7 feet, is seen in the bottom of one of 

 Whitehead Brothers' sand pits, a mile southeast of Weston's 

 mills. The same dark clay has also* been found in the bottom, oi 

 the sand pits on the Island farm, just east of this locality. For the 

 most part, the exposures along Lawrence brook are of a red- 

 spotted clay occurring directly above the shale, and overlaid by 

 a great thickness of Pensauken or by the next higher member of 

 the Cretaceous, the fire sand. Owing to the thickness of this 

 covering, these localities are not, for the most part, favorable for 

 the economic development of the clay. Beyond the limits of the 

 map and southwest of Parson's mills, a white and mottled clay is 

 reported to occur in considerable thickness on the property of Mrs. 

 Eva Van Deventer (264). It is conveniently located in respect 

 to the Trenton & New Brunswick trolley and is not deeply cov- 

 ered by drift. A mile farther southwest, on the property of T. W. 

 J>uckalew (263) (Plate X), 18 feet of gray-white clay — a low- 



