CLAYS OF ATLANTIC COUNTY. 371 



dug at Rosenhayn, Cumberland county. The section recognized 

 there was as follows : 



Section of clay bank at Mays Landing. 



1. Yellow, gravelly sand. 



2. Light clay. 



3. "Pompeian" clay. 



4. Sandy clay. 



The characters of Nos. 2 and 3 are as follows : 



Physical tests on clay from Mays Landing. 



No. 2 No. 3 



Water required to temper, 23.17% 23.40% 



Air shrinkage, 7-50% 8.00% 



Average tensile strength, lbs. per sq. in.,. .. 282 293 

 Cone 05 — 



Fire shrinkage, 0.3 % 



Absorption, n.65% 



Cone 1 — 



Fire shrinkage, 2.80% 3-30% 



Absorption, 8.09% 6.20% 



Cone 3— 



Fire shrinkage, 4.1 % 4.00% 



Absorption, 3-50% 3-6o% 



Cone 5 — 



Fire shrinkage, 4-50% 4.00% 



Absorption, 3.08% 4-36% 



Cone 8— 



Fire shrinkage, 6.50% 5-00% 



Absorption, 0.84% 



Cone 10 — 



Fire shrinkage, 7.1 % 



Absorption, 0.18% 



The lighter clay burns to a deep yellow, which on vitrification 

 passes into a gray green. The other one burns buff and then 

 reddish yellow as it becomes impervious. Neither are fire clays, 

 but they make a strong buff-colored front brick. 



Pleasant Mills. — Cohansey clays also outcrop at Pleasant Mills 

 (Loc. 199) on the Atlantic county side of the stream, but the bed 

 is thin. The material is variable in color, ranging from a bluish- 

 black to a light-yellow or mottled clay, with occasional streaks of 



