Tlic Geological Society of America, — Hoi'ey, lo; 
lirosion," by B. K. Emerson, Amherst College, The paper first 
called attention to the area of basic eruptives at Kirtland, N. Y., and 
the other north of Boston, and then stated that in the intervening 
region basic rocks were rare or wanting. Between the Hudson and 
the Connecticut all eruptives are rare until the region of the Con- 
necticut is reached. The granites of Massachusetts may be divided 
into three groups; a series of outcrops extending from south of Provi- 
dence to cape Ann of granites often hornblendic and of very uniform 
texture and associated with quartz porphyries, rhyolytes, granophyres. 
etc.; a second series of outcrops near the Connecticut which range from 
tonalyte to two-mica granite, and containing great blocks surrounded 
by pegmatyte veins inclosing rare earths; a third, intervening series 
extending in great bands across the state from north to south. These 
are exposed in sections cut at varying depths below the old cover 
and can be arranged in a series like the zonal sections of the anato- 
mist. These sections show that the granites, unlike the coastwise 
granites, have dissolved great quantities of the superincumbent schists, 
incorporating them into their mass. In favorable sections cut near 
the old plane of junction of the two kinds of rock it is possible *•< 
map the whole as granite, and at the same time to carry over its sur- 
face the boundary lines of the different schists which formerly mant- 
led over it and have been melted into it. Where a rusty, graphitic, 
fibrolitic schist covered the granite, the latter is garnetiferous. full of 
a silky, redissolved fibrolite, and contains even in the centers of the 
large, porphyritic feldspars scales of graphite derived from the schist. 
Where a limestone crosses, the granite becomes hornblendic. Where 
a quartz schist crosses, the granite is free from the above peculiarities 
and is almost free from mica, with here and there a thin band of the 
quartz schist dissolving at its ends mto disconnected quartz grains. 
These granites are without porphyries or basic associates, or veins 
of rare earths; they are of very angular texture and often coarsely 
porphyritic; they are generally of coarse, pegmatitic character, as if 
the waters from the inclosed schist had influenced their crystalliza- 
tion. 
Metamorphosed Basic Dikes i/t the Manhattan Schists, Ne-u^ 
Yofk City, By J. F. Ke.mp, Columbia University. Horn- 
blende schists in narrow belts have long been known in the prevailing 
mica-schists of Manhattan island. The paper described with a detailed 
map one special occurrence near the Columbia University campus. 
Analyses and petrographic details of dike and walls were given. 
The Granites on the North Shore of Long Is/and Sound 
with some Observatiojis on the Granites of the At/antic 
Coast in General. By J. F. Kemp. Columbia University 
The general character of the crystalline rocks along the sound from 
Xew Haven to Narragansett bay was outlined, and it was shown that 
they are chiefly granitic gneisses, with profound foliation, but with some 
augen-gneiss, and considerable basic hornblendic and biotitic schist. 
The granites at Niantic and Westerly, R. I., and at New London. 
