194 



sence of a large proportion of clay. The greensand when 

 freed from this adhering clay by washing, is of a dark green. 

 Besides the clay, the mass contains a considerable proportion of 

 quartzose sand. 

 100 parts, afford : 



Greensand, - 58-36 



Clay, - - 27-64 



Quartzose sand, - 14-00 



10000 



A specimen from Horner' s pits, near the Bridge, Horner stown, Mon- 

 mouth county. 



The colour of this marl is a rather light green. After having 

 been washed, its greensand though consisting chiefly of bright 

 green granules, contains, also, some of a brown ferruginous 

 colour. Besides a rather large amount of clay, this marl pos- 

 sesses a small per centage of quartzose sand. 

 100 parts, afford : 



Greensand, - 75*90 



Clay, - - 2010 



Quartzose sand, - 4-00 



10000 



A specimen from John Woolston's pit, one-fourth of a mile south of 

 Birmingham, near Rancocus creek, Burlington county. 



This marl is but slightly cohesive. Its colour is a leaden-gray. 

 Being washed, the greensand exhibits a clear green colour; it 

 occurs in small granules, with a little quartzose sand admixed. 

 100 parts, afford : 



Greensand, - 82-60 



Clay, - - 10-40 



Quartzose sand, - 7-00 



10000 



