480 CLAYS AND CLAY INDUSTRY. 



Parsippany. — Brick clay also occurs at Parsippany (Loc, 297, 

 Lab. No. 730), on the property of J. B. Ricketts. It is probably 

 a glacial-lake clay, and at cone 1 burns to a light-pink brick, which 

 is not steel-hard. It has a fire shrinkage of 0.3 per cent, and an 

 absorption of 18.29 per cent. For common brick it would have 

 to be burned somewhat harder than is usually necessary, but the 

 low fire shrinkage is a desirable point. 



In addition to the above localities, from which samples of the 

 clay were tested, large deposits are known to occur elsewhere 

 along the upper Passaic river. These underlie the region for- 

 merly covered by the glacial Lake Passaic. Since their distribu- 

 tion has been given somewhat in detail in Chapter VI, p. 128, they 

 will be passed with this brief reference. Many of these lacustrine 

 clays are calcareous, and contain an abundance of concretions in 

 certain layers. 



Mount Paul. — A sample of light-colored clay, not very sandy, 

 was received by the Survey from N. B. Thompson, Mendham, 

 from his farm near Mount Paul. It was received too late to be 

 examined physically, and so nothing is known of its qualities. 



Clay-working industry. — As already indicated, common brick 

 are made at Logansville, Morristown and Whippany, and were 

 formerly manufactured at Summit, Chatham, Morris Plains and 

 Chester. Flowerpots and draintile are manufactured at Logans- 

 ville, but not extensively. 



