252 



The amount of potash by experiment in this marl, is 7-5 per 

 cent. 



I present here the analysis of another marl from the same 

 neighbourhood. It is that of Mr. John Howland, of Poplar 

 Swamp. Its colour is grayish-green, owing to a coaling of car- 

 bonate of lime on some of the particles. The washed material 

 is a light and rather rich green. 



Composition. — In 100 parts: 



Greensand, ------ 88*5 



Clay with a little carbonate of lime, - 6-5 



Quartzose sand, ----- 5-0 



100-0 



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

 9-7 per cent. 



Shark River. — Ely's marl pits, on Shark river, present the fol- 

 lowing layers in the descending scries: 



1st. A dark-brown or amber-coloured mixture of sand, clay, 

 and mica; reminding one strongly, both from smell and aspect, 

 of an ooze of the ocean. It sometimes contains thin seams of 

 very coarse sand, completely water-worn and rounded. This bed 

 is between seven and eight feet in thickness, and is seen resting 

 immediately on an iuduratcd or cemented marl. It is visible 

 elsewhere in the neighbourhood, and always has the astringent 

 character of the corresponding bluish sandy clay already so 

 often mentioned, with which, in fact, I hold it to be identical as 

 a stratum. 



2d. A hard cemented marl, being a paste of a yellowish white 

 clay, perhaps containing gypsum, with a moderate sprinkling 

 of the marl grains. Except in its being a cemented mass it 

 differs but little from the bed of friable marl which underlies it. 

 It is two feet thick. 



3d. This lower stratum yields the well known marl so much in 

 request in this part of Monmouth. When moist, the mass pos- 

 sesses a dark, dull, grayish hue, from the colour of the clay 

 which coats the granules. When dry the colour is a very dark 

 plumbago (black-lead) tint, or sometimes a deep olive-green tinge. 

 It consists of little else than the dark granules, the small quantity 



