271 



Marl, from the farm of Jacob GasMlI, near Birmingham, Burlington 

 county. — Lower 'part of the bed. 



Description. — Colour, dark greenish-gray; washed granules, 

 dark olive-green ; rather large. 



Composition. — In 100 parts : 



Greensand, - - - 92-9 

 Clay, .... 6-1 



Quartzose sand, - - 1-0 



1000 



The proportion of potash which this marl contains, by analysis, 

 is 10-8 per cent. 



Marl from the farm of John Woolston, a fourth of a mile south of 

 Birmingham, Rancocus creek. 



Description. — Colour, dull grayish-green ; the washed grains 

 of a light green colour, and rather small size. 



Composition. — In 100 parts: 



Greensand, - - - 82-60 



Clay, .... 10-40 



Quartzose sand, - - 7-00 



10000 

 The proportion of potash, deduced from that of the greensand, 

 is 9-5 per cent. 



Marl from the farm of John Dobbins, a fourth of a mile south of 

 Birmingham, Rancocus creek. 



Description. — Colour, dark olive-green ; texture, granular, gra- 

 nules of a medium size ; when washed of a deep full green. 



Composition. — In 100 parts: 



Greensand, ... 92*75 

 Clay, .... 6-25 



Quartzose sand - - TOO 



100-00 

 The potash, by direct analysis, in this marl is 10-02 per cent. 



