273 



The proportion of potash, as deduced from that of the green- 

 sand, is 8-7 per cent. 



Marl from the farm of Edioard Hilliard, half a mile south of 

 Fincentown. — Lower portion of the stratum. 



Description. — Colour, verdigris-green; the washed grains of a 

 darivcr colour, and very small. 



Composition. — In 100 parts: 



Greensand, - - - 72-58 

 Clay, .... 19-92 

 Quartzose sand, - - 7-50 



100-00 

 The proportion of potash in this marl, by analysis, is 7-9 per cent. 



Eayrstown. — The marl in the meadow midway between Eayrs- 

 town and Newbold's Corner, presents something unusual. The 

 grains are generally coarse and dark green, while some are very 

 light, almost white, and seem to be decomposing. These owe 

 their whiteness to an incrustation of carbonate of lime, their in- 

 terior being of a very light green. 



I here submit the analyses of two marls from the vicinity of 

 Eayrstown, by which it will appear that the greensand formation 

 exists here in considerable purity. 



Marl from the farm of Thomas Edwards, half a mile southwest of 



Eayrstown. 



Description. — Colour, lead-gray; contains a few particles of 

 carbonate of lime, adhesive; the washed granules are light grayish- 

 green, and of medium size. 



Composition. — In 100 parts: 



Greensand, . - . 93.5 



Clay, .... 6-5 



Quartzose sand, - - none. 



100-0 



The proportion of potash which this marl contains, is 10*1 per 

 cent. 



