T. &. Hunt on the Geology of Eastern New England. 87 
the Quebec group. From these investigations of Mr. Murray 
we learn that between the Laurentian and the Quebec group, 
there exists a series of several thousand feet of strata, including 
soft bluish-grey mica-slates and micaceous limestones, belong- 
ing to the Potsdam group; besides a great mass of whitis sh 
granitoid mica-slates, whose relation to the Potsdam is still 
uncertain. ‘To the whole of these we may perhaps give the pro- 
es are name of the Terranovan series, in allusion to the name 
Newfou 
some years since pointed out the indigenous character of the 
so-called granites. In the summer of 1869 I had an opportunity 
of examining, with Prof. L. W. Bailey, the region about St. 
Stephen, on the river St. Croix, where he had already observed 
a series of ferruginous quartzites and imperfect gneisses, accom- 
panied by soft bluish mica-slates sometimes holding chiastolite, 
rt igen = sess These highly ee schists are not 
re than five miles removed from unaltered shales of the 
Gaspé series, noutelaiig fossils of Upper Silurian or Lower 
Devonian types, and rest unconformably upon older id 
rocks, which Prof. Bailey Sega as probably Laurentian. 
these also overlie, uncon riser bs an older granitoid 
More recently "Prof. Hind has pointed out that some Sof the 
so-called granites of Nova Scotia are ancient gneisses, probably 
of Laurentian age, and have shown that between these and the 
gold-bearing slates of that province, there is found, near Wind- 
sor, and near Sherbrooke, a series of beds of no great even nal 
mommies of imperfect gneisses, quartzites and micaceou 
schists, which rest unconformably on the Laurentian, and aos 
sometimes wanting altogether. ese include mica-schists with 
chiastolite and garnet, and appear identical with those alread 
observed. by Dr. Dawson in other parts of Nova Scotia, vihich 
hed alzeeity:.to0 recognized as the same with those of the White 
Monnens a those of the St. Croix, just noticed. Prof. 
Hind, in a late paper, has called these, from their position in 
Nova Scotia, Huronian; but the Cambrian or Huronian rocks 
sect by Messrs. Matthew and Bailey in New Brunswick, 
where they are widely spread along the north side of the Bay 
of Fundy, consist of massive diorites and quartzose fuldepos- 
porphyries, st occasional sandstones and conglomerates, and 
are very un e gneissic and micaceous rocks in question, 
