100 NOKTH-OAEOLESTA GEOLOGICAL STJKVEY. 



which is diffused through it. Beds of this description may 

 be known by pouring muriatic acid over the material when 

 a large quantity of sulphuretted hydrogen is liberated, which 

 has the odor of rotten eggs the smell of which is not usual- 

 ly forgotten. 

 This bed is composed of 



Fine Sand, 93.500 



Peroxide of iron and alumina, 2.000 



Lime, trace, 



Magnesia, trace, 



Sulphuric acid, 1.000 



Water, 3.200 



Potash and soda, (undetermined,) 



99.700 



The bed is partially consolidated. It is, without doubt, en- 

 tirely worthless as a fertilizer. As a geological formation it 

 may probably be regarded as one of the beds of sand which 

 separate the different beds composing the green sand proper; 

 still, no opportunity has as yet been furnished me to see what 

 lies beneath it. 



The foregoing analyses of the green sand furnish all the 

 necessary information respecting its composition. These beds 

 in North-Carolina are deficient in potash, an element which, 

 in New Jersey and Delaware, give to this fertilizer its im- 

 portance. It is possible that exposures of other parts of this 

 formation may come to light, which will be richer in potash. 

 We do not obtain access to the best parts, which may be 

 richer in this element. Other analyses, therefore, of n^ew 

 beds may result in better success, and finally furnish a fertil- 

 izer equally rich with those of New Jersey. 



