References to North American Localities, 151 
Contains present species of animals and vegetables ; also seropiet 
of art. 
Limit between Primitive (Agalysient) and Transition ( Hemi- 
lysient ) rocks. 
The well known Stockbridge marble, (primitive or granular 
limerock, ) is the upper stratum of the primitive rocks of Brong- 
niart. A splendid specimen is the great City Hall of New York.* 
Beginning at West Stockbridge in Massachusetts, this range 
runs northerly through Williamstown, (the College stands on it a) 
Middlebury in Vermont, (very near the College,) and extends 
onwards far into Lower Canada. Southerly it runs a little west 
of the southwest corner of Massachusetts, west of Tiaughconnuck 
Mountain, to Barnagat on Hudson River. Crossing the Hudson, 
it passes seth vccanesy between Newburgh and Butter Hill, of 
the Highiands. Passing onwards in a southwesterly dimetinn; it 
crosses into New Jersey, Pennsylvania, &c., unbroken, into the 
Southern States. I have traced it between three and four hun- 
dred miles. It varies exceedingly in its texture and constituents. 
It often becomes very perfect dolomite—is often friable, and fre- 
quently contains pyrites and micaceous masses. It never con- 
tains a fragment of organic remains. 
Lhe Argillaceous slate meets the granular limerock ( primitive) 
near the meeting boundaries of Massachusetts and New York, at 
and near the northwest corner of Massachusetts, Near the east 
foot of Williamstown Mt., three or four miles west of the Col- 
lege, is a very abrupt meeting of primitive limerock and transi- 
tion argillite. pusnetioks adjoining the lmeterte the: slater bes 
a talcose glazing, as described b 
mains in the ab slate-quarry, nse it to be a transi- 
tion rock. Our State paleontologist, (Mr. Conrad,) has not yet 
given us a name for our abundant petrifaction in this rock. I 
must, therefore, describe it. From Hoosick slate-quarry to the | 
quarry in Dutchess county, (a distance of sixty miles,) and from 
Massachusetts line to Hudson river, (about twenty miles,) we 
find what appears like the fruit-spike of the Lycopodium rupes- 
tre, (festoon pine, ) about two and three inches in length, and one 
eighth of an inch in diameter. I have seen more than twenty of 
them in a square foot of a piece of roofing slate. At Hudson 
city, on the river bank, it abounds in the siliceous slate or basan- 
* One and sometimes two alternations of talcose slate with this rock, precede this 
ality. 
