4 2o CLAYS AND CLAY INDUSTRY. 



The clay was shipped away, but for what use was not stated. 



Bridgeport. — The occurrence of a tough, yellowish-white clay 

 on the land of James Kirby, i mile south of Bridgeport, was 

 also reported by Dr. Cook. 1 The locality is near Raccoon creek. 



The Clay Marls. 



The position of Clay Marl I in Gloucester county is shown on 

 the map, Plate X. The formation is for the most part covered 

 with the sand deposits of the Cape May terrace and exposures are 

 few, except along some of the creek banks. No samples were 

 taken for testing. . 



Outcrops of Clay Marl II are more frequent, and are more 

 promising as sources of workable deposits. 



Woodbury. — Good exposures are found at various points along 

 Mathews brook (Loc. 157), three-fourths mile due west of Wood- 

 bury. Here the clay is probably of considerable thickness, and 

 was tested by boring for more than 6 feet. It is black and plastic,, 

 but not SO' dense as that at locality 156, south of Woodbury.. 

 There is a variable covering of loam, but this in no case exceeds 

 6, or sometimes 10, feet, and much of it might be mixed with the 

 clay. This locality is favorably situated as regards shipment, the 

 railroad being but a few hundred feet distant. A physical test of 

 the clay (Lab. No. 613) from this locality gave the following re- 

 sults : Water required for mixing, 28 per cent. ; air shrinkage, 1 1 

 per cent.; average tensile strength, 193 pounds per square inch.. 

 It burned as follows : 



Burning test of clay near Woodbury, locality 157. 



Cone 05 01 1 3 8 



Fire shrinkage, 4.3% 4-3% 5-3% 6.3% 



Absorption, 1 1.23% 9-34% 6.88% 3.03% 



Color, pale red red red deep red 



Condition, steel-hard viscous'- 



From these tests it is seen that the clay burns a good color and 

 hard at a low cone. The overlying material could easily be mixed 

 in with it to reduce the air shrinkage. 



1 Loc. cit. p. 252. 



