J.D. Dana—Note on the Bernardston Helderberg Formation. 388 
with quartzyte at the Bernardston locality on the west side of 
the Bernardston plain occurs associated with quartzyte at 
different points between Bernardston and Vernon. It some- 
times dips beneath guartzyte and sometimes overlies it. 
(2.) Outcrops of the quartzyte and the peculiar Bernardston 
mica slate together appear east and northeast of Bernardston 
within one to one and a half miles of the Crinoidal limestone 
locality (the intervening flat valley being under drift and 
alluvium), and at intervals beyond, to Vernon, with the same 
aspect and conformable superposition as at the limestone 
locality. 
(3.) In the same region, hornblende rocks, staurolitic slate, 
gneiss and mica schist occur in alternating beds with the 
Bernardston mica slate and quartzyte. 
A mile and a half east of Bernardston,* the Bernardston 
mica slate occurs in alternating beds with the hornblende rock, 
ray-green compact rock, not schistose—with so obvious 
junctions that the alternation cannot be questioned. The ho 
blende rock (1) dips beneath (2) mica slate; this beneath (8) 
hornblende rock; and the last beneath (4) mica slate again. 
Whether there is a fault between 2 and 8 is not certain; but it 
is unquestionable that 1 and 2, and 8 and 4 are strictly con- 
formable. Part of the hornblende rock is speckled white with 
quartzyte and feldspar and is like a quartzytic syenite in con- 
stitution, though unlike true syenyte in aspect. 
Again: a mile to the north of the last. mentioned locality 
and less than a mile and a half northeast of the Bernardston 
rolite, 
quartzyte is in some places a staurolitic slate. Another place, 
farther east, is mentioned in my former paper where the slate 
is abundantly staurolitic. 
ain: in Vernon, four to five miles northwest of South 
Vernon, where the quartzyte is largely exposed to view, one 
of the quartzyte knolls consists partly of mica rock like that 
above described, made up mainly of aggregated scales of brown 
mica but containing distributed through it some quartz and 
* For the position of this locality see my former paper. 
