1 68 CLAYS AND CLAY INDUSTRY. 



Traced southwest towards the head of Cheesequake creek, these 

 bed,s apparently become more sandy and less clayey. Black clays 

 occur in the bluffs at the head of the creek, where they have been 

 dug to some extent for brick clay, but they are not as thick as 

 farther northeast, for here the greater part of the first 90 feet 

 underlying the Clay Marls is sand. Black clays occur in the low 

 ground southwest of Cheesequake (Jacksonville), but whether 

 they belong to this horizon or to 1 lower beds cannot be definitely 

 asserted. 



LAMINATED SANDS NO. 4. 



Below the lignitic clays and sands just described there occurs 

 a great thickness of quartz sand which is usually distinctly lami- 

 nated, often with very thin seams of more clayey material. These 

 sands are well exposed in the bluff above the clay in H. C. Per- 

 rine's South Amboy pits (77), where there are 27 feet of yellow 

 and white sand with thin laminae of black clay in the lower por- 

 tion. Southeast from- here along the shore to Morgan station 

 the same and higher beds are exposed. Here they are covered by 

 a few feet of yellow gravel belonging to the Cape May formation. 

 Locally these sands are lignitic, but on the whole they are light- 

 colored and present a marked contrast to the dark-colored sands 

 and clays east of Cheesequake creek, which lie above them. 

 These same sands are also well exposed in the bluffs along the 

 west side of Cheesequake creek, above the stoneware clay, which 

 is dug at several points. At Perrine's bank (80) (formerly 

 Ernst's), about 75 feet of sand with some thin clay seams are 

 shown along the road leading down to the clay pits. 



The thickness of this member was estimated by Cook and 

 Smock to be about 40 feet, but this seems to be too small, in view 

 of the above exposure. The maximum is probably not less than 

 75 feet. 



THE AMBOY STONEWARE CEAY. 



The next lower member of the Raritan series is the Amboy 

 stoneware clay. This name was given by Cook and Smock, and 



