4 oo CLAYS AND CLAY INDUSTRY. 



per cent.), as compared with some of the other Clay Marls. Its 

 air shrinkage was 7 per cent. At cone 05 the fire shrinkage was 

 2 per cent.; absorption, 18.28 per cent.; color, light red, and 

 bricklet not steel-hard. At cone 03 : fire shrinkage, 4 per cent. ; 

 absorption, 15.72 per cent; color, light red. At cone 1: fire 

 shrinkage, 8 per cent. ; absorption, 8.42 per cent. ; color, red, and 

 clay steel-hard. 



It is probable that the material would not make a good brick 

 much under cone 1. The deposit is easy of access for working 

 and shipping the product. 



Oakdale station. — The chocolate-colored clay, the weathered 

 portion of Clay Marl II, outcrops along the bank of Peters creek 

 at numerous points one-half mile south of Oakdale station. The 

 covering of pebbly loam is only 2 or 3 feet thick and the clay is 

 found 15 or 20 feet above the creek. This deposit is favorably 

 located for shipment both as respects the creek and railroad. 



Clay Mad IV. 



Clay Marl IV outcrops in the P. & R. railroad cut just north 

 of Bellmawr station (Loc. 148), and 1 mile south of Mount 

 Ephraim. The clay, which is sandy, and micaceous, is about 8 

 feet thick and is exposed for a distance of probably 200 feet. 

 It has as much plasticity as many brick loams. The stripping of 

 Pensauken gravel and sand is from 7 to 8 feet. 



The physical properties of this clay (Lab. No. 633) indicate it 

 to be as good as many other brick clays, although its air shrinkage 

 is rather high. It worked up with 20.8 per cent, water and had 

 an air shrinkage of 9 per cent. Its average tensile strength was 

 195 pounds per square inch. In burning it behaved as follows : 



Burning test of a clay from Bellmawr, Camden county. 



Cone 03 13 5 



Fire shrinkage ... 3% 3% 3-5 % 4-3 % 



Absorption, 14-55% 12.71% 12.06% 7-47% 



Color, red red red reddish brown 



Condition, not steel-hard not steel-hard steel-hard 



The clay became thoroughly viscous at cone 10. 



