T. S. Hunt on the Geology of Eastern New England. 89 
setts, near Lake Memphremagog in Vermont, and further north- 
ward in the province of Quebec, fossils of this horizon are found 
in rocks which, in some localities, are more or less altered and 
crystalline, I believe however that much of the calcareous mica- 
slate of Eastern Vermont will be found to belong to the Terra- 
novan series. The extent of these newer rocks, and the limits 
between them and the more ancient schists, of the ruins of which 
investigation. For the solution of these, Prof. C. H. Hitchcock, 
by his labors in Vermont, is already well ‘prepared, and it cannot 
be doubted that he, with his able assistants, will in the Surve 
of New Hampshire, now in progress, throw much light on New 
prema geology. It is worthy of remark, that strata holding 
fossils of Lower Helderberg age, or thereabouts, are not confined 
to the shores of Maine and New Brunswick, and the valleys of 
the Connecticut and St. John rivers, but are found beyond the 
Green Mountains, in the valley of the St. Lawrence, near’ Mon- 
treal; where, on ‘the island of St. Helen, they rest unconform- 
ably on n the Utica slate, and at Belceil Mountain , near by, on 
intrusive vad ee which there break through the ‘shales of the 
Hudson River group. 
The relations af this Terranovan series to the porphyries and 
diorite rocks which, in New Brunswick, have been called Cam- 
brian and Huronian by Mr. Matthew (first distinguished b 
him as the “ora group), yet —— to be determines 
near to the 
Newb ort, and at Salem, Lynn, and Marblehead, Massachu- 
setts. Farther researches about er Bay, where 
the mica-slates are found not far removed from th rphyries, 
will probably enable us to determine their paladin to’ each 
other. 
It will be remembered that Giimbel has found, in Bavaria, 
beneath the laa fossiliferous clay-slates, a mica-schist (and h orn: 
blende-schist) series, reposing upon the Hercynian gneiss, which 
tian of North America. He distinguishes beneath this a t 
mass of red gneiss, apparently without limestones, to which he 
has given the name of the Bojian gneiss. It will however be 
remembered, that in his studies of the Laurentian system on the 
