218 J. D. Dana— Geological Relations of the 
limestone, on the north side of the road, a ledge commences 
which extends along for nearly 350 feet, with no dike-like sub- 
divisions. It consists mainly of noryte and augite-noryle, but 
with some hornblendyte and noryte-gneiss, and has distinct inti 
of bedding in several places, all - which are conformable to 
another. The strike of its beds is N. 27° W., or nearly shad of 
the limestone, and the dip 60° S 70° K. Part of the noryte 
is garnetiferous. Figures 18, 19, represent the stratification 
18. 
= Se \ ee || ia ee 
Coe | c 
eee eet ee be Tor Ten Ce 19. 
w iN se 
western; forty feet ‘of earthy interval separates the two. 
gneiss, affording perfect observations of the strike and dip. West 
of this the rock is mainly noryte and augite-noryte. Atc, for 
eight feet, black bands (or beds less feldspathic than the rest) 
alternate with the ordinary gray-black rock, and exemplify the 
conformability stated, though without divisional planes; at d, 
are ohio Bay in bay gray-black augite-noryte, having 
the strike ° W. and dip 70° KE. At e is a much Roouey 
or the west end, the rock is again oe a and a. with 
at the east end. 
This ledge, although made up mainly of massive noryte and 
augite-noryte, bears thus positive evidence of its having once 
had bedding throughout, and affords thereby a demonstration 
that its noryte is of metamorphic origin, and that the associated 
beds comprised also the limestone of the region. 
(5) A bed of Sova in noryte.—A bout bh alf a mile east of the 
limestone number 5, about the Montrose Station, the rock is the 
ordinary Caenrar tele noryte. 120 yards up the road going 
northeastward from the station, a bed of whitish granitoid quartz- 
yte outcrops on the roadside for seventy yards, first on the west 
and then on the east side. This bed of quartzyte overlies 
