1846.] Agricultural Geology of Onondaga County. 163 



Sandy. Marly. 



99.50 99.25 



The sandy variety was taken from Canastota, in Madison 

 county; the marly from Kirkville, in Onondaga county. 



Observation and the result of analysis show, that this rock 

 Jbrms a valuable soil. It is instructive, however, to compare the 

 composition of the soil with the rocks: thus, the soil of Canas- 

 tota is composed of, 



100.41 



We see a great loss in carlsonate of lime, and a considerable 

 change in the other constituents. The analysis shows that the 

 sioil and rock beneath do not agree in composition, and that we 

 cannot rely upon a supply of lime even when the rock itself is 

 highly calcareous. 



A practical observation of some value is, however, suggested 

 by these analyses; namely, that when this red marl is favorably 

 situated, it may be spread over the soil with advantage. It will 

 especially have a decided effect in improving wheat lands. 



