314. JS. D. Dana— Geology of Westchester County; N. Y. 
Mr. Stevens’s figure of the section on 122d street, in the Annals 
of the New York Lyceum, referred to on p. 432 of the last volume 
of this Journal, is so very unlike what I have found at the place, 
and agrees in so many points with that of the more western belt 
on 132d street, of which also he speaks in the article, that I have 
suspected it to be wr ongly labelled. 
2. Contact-phenomena in the Schist and heard. te a of Cruger’s 
and Stony Poin 
n my remarks on the rocks at Cruger’s ans Reidy! aged I have 
sustained the view that the contact-phenom they may in a 
literal sense be called, between the mica at ist an aa soda taal. 
are not results of contact of the schist sil a pasty or liquid rock. 
I add here a few more words on this point. 
tact-phenomena are these. The mica schist ch nen BR 
v es 
to the northward in many plies: sibs ada and deep zigzags ; (2) 
from a finely crystalline state to a coarsely er ystalline—in connec- 
tion with which change phate is an increase in the size and 
abundance of garnets; (3) fr pre eh mica schist, to a 
corti and fibrolitic mica se ist, with also an increasing 
abu ce of garnets; (4) from a near freedom from quartz 
seams to a at ye of ibe vasa Megane Milde them ; and 
approaches that of the granite. Besides the ab he  epanite 
often contains (6) scattered garnets near the junction, and also 
ear and remot m the schist, numerous inclusions of 
or many of them short fragments others long, flexed, or 
zag layers, parallel in position to the bedding of the schist 
patatdle: some fading nearly into the granite and vein-like, others, 
especially if staurolitic, having all the characters of such layers 
in the outside schis 
The following considerations are ye vi to confirm the cor- 
rectness of the conclusion to which I have been led as to the 
ri 
firmness, r endered siaieetly so By it - numerous quartzose inter- 
laminations—must have been made at the time when its meta- 
morphism took place ; for their pr pauELILH after it was in its solid 
crystalline condition would be i fe hal or, at least so without 
its having every where avidenes of fractur 
2) The zigzag and other flexures in the schist indicate that 
great pressure was exerted fi me eh ction against the 
agencies, 
