78 NORTH-CAROLINA GEOLOGICAL SURVEY. 



ses, however, that the ash is variable in the proportions of 

 its elements. 



The tobacco which obtains the highest price in the Paris 

 market contains a much larger proportion of potash and less 

 lime. This specimen had the line yellow brown color which 

 is regarded as indicative of the best quality. As it is, how 

 ever, it is a lime plant, nearly one-half being composed of 

 carbonate of lime. 



CHAPTER VI. 



FERTILIZERS CONTINUED . 



Marl beds, or Marl formations. The different periods to which they belong, 

 or their relation to each other. 



52. There are three distinct formations from which marl 

 is obtained. Enumerating them in the ascending order, or 

 according to age, they lie relatively to each other as follows : 

 1. Green Sand ; 2. Eocene Marl 3. Miocene Marl. 



The first, or green sand, is the formation which is so favor 

 ably known in Xew Jersey as a fertilizer, having been em 

 ployed for that purpose for more than half a century. It 

 derived its name partly from its green color, and partly from 

 its granular consistence. The beds thus named are known 

 not only in this country but also in many parts of Europe 

 by the same name, and where, to a certain extjnt, they are 

 also used as a fertilizer. 



In the geological systems its beds are subordinate to the 

 cretaceous system, and in Europe form subordinate beds be 

 neath the chalk the white chalk in common use for marking. 



