104 
GEOLOGY OF THE THIRD 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 the 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 with 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. 
