235 



like that of Mr. Smock's. The following analyses will show the 

 composition in 100 parts, of the upper and lower strata, the last of 

 which is the best. 



Upper stratum : 



Greensand, - - - 70 



Clay, - - - - 27 



Quartzose sand, - - - 3 



100 



The amount of potash, as deduced from that of the greensand, 

 is, in the upper bed, 8 per cent., in the lower 10-5. The washed 

 grains of the above marl are of a rich green, and small in size. 



Large excavations have been made to the north and east of 

 Bucks, by Mr. Charles Hendrickson, and a marl obtained cor- 

 responding in character to the preceding. 



The above specimens furnish fair examples of the character of 

 the marl in the vicinity of Swimming river. 



Few exposures of marl are noticed in the tract between Bucks 

 and Bloomdel. One and a half miles west from the latter place, 

 it has been quite extensively worked by Elisha Holmes and Mr. 

 Ely. A specimen taken at a point one-fourth of a mile from 

 Bloomdel, where the road approaches to the side of Swimming 

 river, will furnish an example of the marl of this neighbourhood. 



This marl is greenish-brown in colour, and somewhat argilla- 

 ceous in texture. When washed, its granules become more dis- 

 tinctly green, they are of small dimensions. 



Composition. — In 100 parts: 



Greensand, - - - 83 



Clay, - - - - 13 



Quartzose sand, - - - 04 



100 



By direct analysis, this marl yields 8-5 per cent, potash. 



