206 Screntific Intelligence. 
IL The Green Mountain Series, characterized, he observes, pe 
mica schists and nenereened micaceou 8 gneisses, the latter often 
light-colored, fine or coarse-grained and sometimes porphyritie; 
ae mica Ae ie ae in mica than those of the Green Mountain 
us quartzite ; hornblendic gneisses and schists; 
aK’ or yatale’ ffitiewtoinds accompani nied by boston Se ido- 
crase, sphene and graphite, like the limestones of t urentian, 
ut t often intimately associated with highly eer schists. 
aining staurolite, andalusite, cyanite and garnet, and some 
sha highly plum mbaginous. The rocks are ‘ated ed by granite 
veins containing tourmaline, beryl, lepidolite, and occasionally 
tinstone and moaned only the ak i ip minerals occurring; 
as far as known the bau rentian ¢ 
After thus dividing Lithologie aly ae ack into these t 
series, Dr. Hunt endeavors to trace them southwestward along the 
Appalachians, through the ddittiptions of other geologists 5 and 
is not where upon; neither is the value of lithological a 
amon stalline rocks in the determination of geolog! 
equivalency diacnsved, beyond making an affirmation on the oe 
and citing the opinions of one or two authors 
he history of the discoveries and views of geologists La 7 
with them in the Green Mountain > is next ably ae 
rg eye pera “Green Mountain Series,” he 84 10 
“ Although I have, in poeined with most other American ge 
i t 
eastern North Americs are not only pre-Silurian but ‘pre-Cambrias | 
in age”—a conelusion which all will say should be thorough 
tested by reference to stratigraphical facts before it is gen@ 
accepted. 
