146 CLAYS AND CLAY INDUSTRY. 



ern R. R., 5 miles west by north of Drummond's, a thick black 

 clay occurs at an elevation of 1 10 to 120 feet. Above it and inter- 

 bedded in its upper portion is a light, fluffy, micaceous sand. At 

 its base the clay is sandy, with some ironstone, beneath which is 

 probably the marl. There is no question but that the clay at 

 Deckers and Drummond's pits belongs to the same general 

 horizon, which has a rise of about 18 feet per mile between the 

 two points. 



A mile north of Centreville, clay is known to underlie a con- 

 siderable area on the property of Mr. D. H. Applegate (270). 

 Numerous borings have shown that it rests upon a bed of marl, 

 at an elevation of 90 feet. Its thickness, including 3 or 4 feet 

 of a surface loam, which may be of somewhat later origin, is 14 

 to' 17 feet. Most of this clay is light colored, but some borings 

 have struck black clay. 



On the west side of the Hominy Hills, east of Jerseyville, at 

 Brockelbank's clay pits (214), a laminated sand and clay occurs 

 at an elevation of about 115 feet, and borings have shown a 

 marly sand at 95 feet A. T., the intervening beds being chiefly 

 sand, with clay laminae; a very sandy phase of the Asbury clay. 

 Very similar deposits occur at the old brickyards, near Shark 

 River station on the N. J. Southern R. R. 



These data apparently indicate that the Asbury clay extends 

 ais far west as the west side of the Hominy Mills and underlies 

 them, but that in the western portion of the area it becomes very 

 sandy. Borings show that in the vicinity of Pine Brook, at the 

 north, the clay has also thinned out. Sufficient data are not at 

 hand to determine its southern extent. It is not known to occur 

 south of the latitude of Shark river. Within the area thus 

 roughly outlined, the clay is in general deeply buried by the 

 overlying sands and gravels. It is only on the bordering slopes 

 to the lower ground or along streams, which have cut into it 

 deeplv that the clay has been found. Further search for it should 

 he controlled by the fact that the bed dips about 18 feet to the 

 mile to the southeast from elevations of 1 15 feet on the northwest 

 at Applegate' s, Decker's and Brocklebank's to 25 feet at Drum- 

 mond's, near Asbury Park. 



