654 LEWIS"G. WESTIGATE, 
For eruptive amphibolites occur abundantly in the schist and 
presumably sedimentary gneisses outside the granite-gneiss area, 
and at one point within the granite-gneiss (Map, 6) banded 
amphibolites occur grading into massive hornblende-gabbro, and 
this basic rock becomes finer grained toward the contact where 
it cuts across the foliation of the granite-gneiss. Some of these 
amphibolites, then, are certainly younger than the granite-gneiss 
and cut it. Some may be older than the granite-gneiss. 
The relation of the spotted-gneiss to the more ordinary 
granite-gneiss is not altogether clear. In some cases parallel 
bands of the two le in sharp contrast. Again within limited 
areas a complete series of intermediate rock types occur. The 
spotted-gneiss seems to be a somewhat more basic rock derived 
from the same magma as the granite-gneiss. In part, however, 
it looks as if the two were not strictly contemporaneous. The 
spotted-gneiss may have been intruded into the granite-gneiss, 
or vice versa, although both find their origin in the same molten 
body and were the products of a single igneous intrusion. 
Lewis G. WESTGATE. 
