186 J. D. Dana on the Green Mountain Quartzite. 
structure in the quartzite demonstrates that its origin antedates 
the deposition of the limestone. 
The ledges 5 and 6 (see map, p. 183) are stated to have the 
opposite dip that indicates a fold. But No. 6 is altogether too 
narrow to be the counterpart of No. 5, or the other half of the 
+ * . . 80. 
forming to the jointings of the quartzite but oftener not, may 
The conclusions to which the facts lead are, therefore :— 
That the quartzite is the inferior rock 
(8) That the jointing, u lifting and consolidation of the 
quartzite took place before the limestone was deposited. 
