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96 Geological Ne otices. 
blende slate, and is traversed in every direction by thin veins of epi- 
dote, generally accompanied by micaceous iron ore, in small quantity 
and sometimes also by sphene. Small beds of steatite, are sometimes 
found, and the surface has abundance of boulders of granite, and 
gneiss, scattered over it. The character of the rocks continues neat- 
ly the same to Willimantic falls, in Windham, except, that occasion- 
ally, the gneiss passes into mica slate. About four miles west of 
Brooklyn, the dip is barely sensible to the eye, but in the same di- 
rection as before; at Willimantic falls, the dip is in the reverse di- 
rection, viz. to the n. s. £. although it is not perfectly constant in its 
direction, for it is occasionally seen dipping to the £. s. £. and s. gen- 
erally about 6° or 7°. Here the gneiss is traversed in every di- 
rection by veins of granite, in which the feldspar is frequently repla- 
ced by albite. ‘The Clevelandite generally constitutes the mass of 
the veins. Phosphate of lime, and garnets, are found in these veins. 
A fine view of the strata can here be obtained on the river banks, 
and where the rock has been quarried, for building six or seven cotton 
mills, with the dwelling houses, and other necessary buildings. 
In passing from Windham to Lebanon, the rock is not seen in place 
on the south road, but on the north one, soon after crossing Shetuck- 
et river, you see it often in place for several miles. 
On the south road and for several miles to the south of it, the scat 
tered debris are seen of the sienitic and hornblende rocks that form 
the ridges between Shetucket river and Lebanon. A mile or two 
west of Lebanon, the sienitic and hornblende rocks, pass into gneiss 
and this rock continues with occasional passages into mica slate, 1 
Connecticut river, at East Haddam. 'The dip is generally a little to 
the west of north, from the ridge west of Shetucket river, but is some- 
what variable as to its quantity, generally not exceeding 20° until we 
approach the western part of East Haddam, where it approaches @ 
vertical position. 
To the west of Colchester, the gneiss is disintegrating into a strat 
ified gravel, forming gravel hills, in some of which, the rock may be 
observed in its different stages of decomposition. 
Passing from Millington, to the north society in Lyme, a beautiful 
section of the gneiss fock is seen. The strata dip uniformly about 
10° to the n. of w. and are seen sometimes two or three hundred feet 
above the observer. 
On the road from Colchester to East Haddam, near the Baptis! 
chureli in the Jatter township, powerful veins of aranite are observes 
