249 



and bring to shore not only portions of this upper bed, but likewise 

 of the softer mail below. 



Beneath this upper bed in the pit at Elisha West's, there occurs 

 a hard, somewhat firmly cemented mass, consisting of light green 

 grains and a little ordinary sand, the whole being eight feet thick. 

 In it is a very thin layer of white clay. liOwer down we meet a 

 gray and afterwards a yellowish ferruginous marl, both rather 

 sandy, and in aggregate thickness about three feet. 



Siill lower and throughout the rest of the vertical section we 

 find a layer of yellowish ferruginous sand, containing a very 

 moderate proportion of the green grains. Few or no shells are 

 visible in the perpendicular wall or section disclosed in this pit, 

 but numerous traces of casts occur, showing that they have once 

 been there, and intimating the nature of the change which they 

 have undergone, and the possibility that they may have furnished 

 to parts of the stratum a small amount of diffused carbonate of 

 lime and perhaps gypsum. 



The marl from the pit of Elisha West displays by analysis the 

 followins: 



1000 



The amount of potash, deduced from the above proportion of 

 greensand is about 8-4 per cent. 



This marl is a light yellowish green ; adhesive; the admixed 

 clay giving it a mottled appearance. The washed material is 

 darker and more distinctly green; the granules are small. 



Tinton Falls. — The stratum here is a dark brown and greenish 

 friable sandstone, which forms a horizontal ledge across the 

 creek, causing, by its abrupt termination, a sudden fall of about 

 sixteen feet. It seems to be nothing more than a very sandy and 

 highly ferruginous marl, consolidated by the cementing action of 

 the oxide of iron into a moderately compact sandstone. It 

 abounds in the usual characteristic shells of the marl series, but 

 these are almost invariably in the state of casts. The amount of 

 the green grains in the rock is not very considerable, though 



