144 CLAYS AND CLAY INDUSTRY. 



and subjected to various physical tests, the results of which for 

 locality are given in detail in Chapter XIX. A tabulation of 

 the physical tests is given in Chapter XVIII. 



THE MICACEOUS, TAIX-UKE CLAY. 



Immediately below the Alloway clay there occurs, in the 

 vicinity of Woodstown and towards Ewan Mills, a thin bed of 

 white, micaceous, sandy clay, which is quite unique. Where 

 pure, it is snow white in color, though it is not infrequently 

 stained yellow by iron. It has a marked, soapy, talc-like feeling, 

 sot much so that in our notes it is referred to as a talc clay, 

 although, strictly speaking, it is not talc at all. The bed is prob- 

 ably never more than 10 feet thick, but it is apparently quite con- 

 stant in horizon. It is not very plastic and of doubtful value as 

 clay. It is well exposed in the railroad cut just north of Woods- 

 town (170) and at an old pit east of Harrisonville (173). 



THE EEUFEY SAND. 



Beneath the micaceous, talc-like clay there is a bed of fluffy 

 sand, which, in Burlington county and southwest to Salem county, 

 forms the lowest of the Miocene beds. At its very base there is 

 not uncommonly a layer of pea-gravel a few inches in thickness, 

 but this is not everywhere present. To the southwest, in the 

 vicinity of Quinton and Alloway, its thickness is less than 10 

 feet, but it thickens to the northeast, having a thickness of 50 

 feet or more east of Mullica Hill. It extends much farther 

 northeast, but beyond this point its exact limits cannot be. deter- 

 mined, since the overlying Alloway clay is absent and the Cohan- 

 sey sand, which lies above the Alloway clay, is brought into jux- 

 taposition with the "fluffy"' sand. 



This sand is often, in fact usually, delicately colored in pale 

 shades of pink and yellow, which frequently make a w^avy band- 

 ing, due not so much to stratification as to the irregularities of 

 coloration. This sand contains some laminae and thin beds of 

 clav, but none in the southwestern part of the State that are any- 

 where worked, and none apparently of commerical importance. 



