194 GEOLOGY OF THE TfflRD DISTRICT. 



unbroken and so perfect a succession exists, as in this State. The last remark to make on 

 this group is this : It stands by itself, at tlie top or head of four divisions as a group, for this 

 reason simply, that it has more relationship with the Coal deposit or group than with any of 

 the groups below. It forms witli the Coal and the New redsandstone, a natural and a triune 

 division of a universal classification, but which cannot be made without commencing and 

 completing the geographic ones. 



