460 ADDRESS OF T. STERRY HUNT. 
while in the range of the Highlands, the gneiss belt of the South 
Mountain crosses the Hudson river. 
The three series of gneissic rocks which we have distinguished 
in our section to the northward have, in southeastern New York, 
as in Pennsylvania, been grouped together in the primary system, 
and may thence all be traced into western New England. In Dr. 
Percival’s geological report and map of Connecticut, published in 
1840, it will be seen that he refers to the gneiss of the Highlands 
two gneissic areas in Litchfield county ; the one occupying parts of 
Cornwall and Ellsworth, and the other extending from Torrington, 
northward through Winchester, Norfolk and Colebrooke into Berk- 
shire county, Massachusetts. Farther investigations may confirm 
the accuracy of Percival’s identification, and show the Laurentian 
age of these New England gneisses, a view which is apparently sup- — 
ported by the mineralogical characters of some of the rocks in this 
region. Emmons informs us that primary limestones with graphite, 
(perhaps Laurentian), are met with in the Hoosic range in Massa- 
chusetts east of the Stockbridge (Taconic) limestones.  - 
The rocks of the second series are traceable from southwestern 
Connecticut northward to the Green Mountains in Vermont, and 
the micaceous schists and gneisses of the third or White Mountain 
series are found both to the east and the west of the Mesozoic val- 
ley in Connecticut and Massachusetts. They also occupy a Con- 
siderable area in eastern Vermont, where they are separated from 
the White Mountain range by an outcrop of rocks of the second 
series. To the southeast of the White Mountains, along our line of 
section, the same mica-schists and gneisses, often with very mod- 
erate dips, extend as far as Portland, Maine, where they are inter- 
` rupted by the outcropping of greenish chloritic and chromiferous 
schists, in nearly vertical beds, which appear to belong to the sec- 
series. 
I find that the strata of the second series appear from beneath 
the Carboniferous at Newport, Rhode Island, in a nearly vertical 
attitude, and also in the vicinity of Boston and Brighton, Saugus 
and Lynnfield. Their relations in this region to the gneisses with 
crystalline limestones of Chelmsford, ete., which I have referred to 
the Laurentian series,* have yet to be determined. 
We have already mentioned that the crystalline rocks of Penn- 
sylvania pass into Maryland and Virginia, where, as H. D. Roger? 
* Amer. Jour. Sci., II, xlix, 75. 
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