Remains of Fossil Mammalia, ^d. 



147 



inch in length, and of a proportionate thickness. These are the only- 

 instances, which have come to my knowledge, where fossils of this 

 class have been found in secondary rocks. In a sandstone cave, in 

 Wood County, Virginia, bones are found in the rock on the bottom, 

 but they are the bones of deer, which stalagmites have enveloped ; 

 a solution of the carbonate of hme, dripping through the sides of the 

 cave has slowly concreted over them. Extensive salt petre caves 

 are not common in the coal measures ; there are therefore no recep- 

 tacles of this kind, for fossil bones. Granite bowlders, so abundant 

 all over the tertiary region, are very seldom seen in the secondary- 

 portions of "the valley." 



A tabular view of the specif c gravity, and combustible qualities of 

 the Bituminous Coals, from different places in the coal measures 

 of the valley of the Ohio. 



The foUovjing is a list of English Bituminous Coals; copied from Dr. Ure. 



100 parts of best English coal, give 

 " " of Newcastle " " 



" of Wigan 

 " " of Slaty cannel " 



