1893. | NEW YORK ACADEMY OF SCIENCES. 105 
afforded. But such is not the case; they are entirely distinct, 
the granite being younger. This conclusion is not based upon 
actual contact relations between the two rocks, for no contact 
was found. But it is believed that the marked difference in 
petrographic character and degree of metamorphism affords 
sufficient evidence for regarding the formations as distinct. 
The granite of the main ridge was traced, with occasional 
breaks, over a distance of ten miles, without reaching a limit. 
The height of the ridge varies from nothing up to two hundred 
feet, the width averaging perhaps a quarter of a mile, A 
peculiar topographic feature is presented in the presence of 
several basins in the ridge, partially enclosed by precipitous 
walls and with flat meadow bottoms. These may represent 
masses of limestone, that have been weathered out from the 
surrounding granite. 
The village of Hailesboro is built upon the granite and affords 
a favorable locality for its examination. In the angle between 
the creek and highway, E 9, a low hill of granite shows well 
the general character of the rock, together with a peculiar 
modification. The average rock is a coarse grained aggregate 
of quartz, white feldspar, and biotite, the latter constituent 
varying greatly in quantity, and often entirely absent. No 
muscovite has been seen, even of secondary origin, and the 
rock must, therefore, be classed as a granitite. Gneissoid 
structure is seen in a few areas of limited extent, but is not so 
marked as at some other localities. Near the northern edge of 
the outcrop the granite shows a fine grained, white phase. 
This crumbles under the hammer and looks much like a white 
sandstone, though showing no parallel arrangement of constit- 
uents. Microscopic examination shows it to be a fine mosaic 
of quartz and feldspar, with numerous coarser grains of garnet, 
often with crystal outline. That this rock is simply a peculiar 
phase of the granite is shown by the passage of one into the 
other by imperceptible stages. This modification of the 
granite, which may be distinguished as granulite, occurs at 
many points in the region, and always shows the same gradual 
transition into ordinary granite. Several patches of dark 
silicates enclosed in the granite, being sharply separated from 
itand made up chiefly of hornblende, are presumably inclusions 
brougit up from deep-seated rocks. Quartz veins are abundant, 
and represent at least two periods of fracturing and infiltration, 
This outcrop also shows well the contact with limestone. The 
granite breaks through the limestone causing great disturbance 
of strike and dip, and completely enclosing masses of the rock 
many feet in diameter. The effects of contact metamorphism 
