198 STRATIGRAPHICAL GEOLOGY. 



proof of such an age and origin, but an array of facts which appear to me incompatible 

 with the hitherto received view, and lead me to conclude that the whole of our crystal- 

 line schists of eastern North America are not only pre-Silurian but pre-Cambrian 

 in age. 



Views of G. L. Vosc. In a paper before the American Association 

 for the Advancement of Science, at BurHngton, Vt., 1867, Mr. Vose re- 

 marked as follows : 



Regarding the arrangement of the great central mass of rocks forming the main 

 chain of the White Mountains, it was stated that this portion of the group appeared to 

 have neither the anticlinal build of the older geologists, nor yet the regular synclinal 

 build more recently suggested ; but that the top of Mt. Adams, of Mt. Jefferson, of 

 Mt. Clay, and the section from Tuckerman's Ravine through the Lakes of the Clouds, 

 all seemed to show a prevalent steep dip to the north and north-west ; and it was sug- 

 gested that the main chain of the White Mountains was formed by a fragment of the 

 western slope of an immense anticlinal wave, of which the crest would have been over 

 the Peabody valley, and of which perhaps a fragment of the eastern slope may be 

 found in the opposite and parallel range of the Carter Mountains ; in which case the 

 Peabody valley would be a valley of denudation. 



In 1869 Mr. Vose prepared a report upon special details of the geology 

 of Jackson, Conway, Mt. Pequawket, the Ossipee mountains, etc., which 

 was printed in the annual report for 1871. As he indicated no generali- 

 zations concerning the structure of the mountains, it will be unnecessary 

 to reprint any portion of it here. 



After the presentation of the few remaining facts relating to the dis- 

 tribution of the White Mountain formations, I will offer a few general 

 considerations concerning their structure and probable age. 



Sketch of the Geology along the Grand Trunk Railway, from 

 Island Pond, Vt., to Gilead, Me. 



BY ;. H. HUNTINGTON. 



As the rocks are more accessible along the lines of our railways, we 

 give here a summary of the facts relating to the geology on the line of 

 the Grand Trunk Railway. 



As a view of the crystalline rocks, the geology along this line is 

 intensely interesting; and so varied are the rocks that at every turn, 

 almost, the scenery changes. 



The artist is not often satisfied to place upon his canvas a view as 

 seen from a single point. Here he traces the bold outline of a mountain ; 



