267 



The proportion of potash in this marl, deduced from that in the 

 greensand, is 6-4 per cent. 



Marl from the farm of Caleb Newbold^ two miles southwest 

 of Plattsburg, west side of Lowland road. 



Description. — Colour, pea-green; the washed grains small in 

 size, and of a sea-green colour. 

 Composition. — In 100 parts: 



Greensand, ... 84-10 

 Clay, .... 15-90 

 Quartzose sand, - - none. 



10000 

 The proportion of 'potash in this marl, by direct analysis, is 

 9-2 per cent. 



Marl from the farm of Thomas Black, two miles tvest of 



Plattsburg. 



Description. — Colour, dark dull green, but little changed by 

 washing ; granules large. 



Composition. — In 100 parts: 



Greensand, ... 90-50 



Clay, .... 9.50 



Quartzose sand, - . none. 



100-00 



The proportion of potash which this marl contains, ascertained 

 by direct analysis, is 10-8. 



Arney's Mount is a considerable hill at the Friends' meeting- 

 house, one and a half miles southwest from Juliustown. The 

 sandy soil of the neighbourhood, even that of the road, is mixed 

 with the greensand, so that its colour is sensibly influenced by it. 

 Eastward from the meeting-house, a few hundred yards, there 

 is a small opening on the road, where the ferruginous conglome- 

 rate has been quarried. Most of the cemented particles in this 

 rock are grains of coarse siliceous sand, but some of them are 



