402 Eimmons on American Geology. 
ing a belt along the eastern slope of the Alleganies extending from 
Canada to Georgia. Such modes of occurrence scarcely go to 
confirm the notion of its intrusive character, yet we are told that 
“the facts revealed by the relations of the associated rocks, sup- 
port the view that serpentine is truly an eruptive rock, and be- 
longs to the same class as granite and syenite,” (p. S9—) “ while 
it occurs so rarely among rocks of sedimentary origin, that its age, 
even approximately, is left undetermined.”” Who but Mr. Emmons 
will deny the sedimentary origin of the Green Mountain rocks? 
We pass now to note some extraordinary statements with re- 
gard to the eruptive rocks on the Hudson River, known as the 
Palisades, which Mr. Emmons tells us— 
** Are upon a north and south line of fracture, which extends north- 
wardly through the valleys of the Hudson, Champlain, and St. Law- 
rence, in the range of Montreal and Quebec. The trap rarely appears 
on this line between the Highlands and head of the Champlain Valley. 
At this point trap begins to appear again, and with frequent repetitions 
down to Port Kent. From this place onward to Montreal, the disturb- 
ao 
. 
mity between the Champlain and Ontario divisions. ‘Subs 
quent disturbances have affected the latter, as well as the | i 
ee 
