26 Geology, yc. of the Connecticut 
In springs occurs a species of Lymnaca, Say, and i in our Jar- 
ger streams, Planorbis trivolvis and Unio purpureus, Say, 
or common river clam. 
5. Tancose Stare. Rees Cyc. Bakewell. 
Talcose Schist. Maccullock. 
Taleose Slate. Eaton. 
Colored Gamboge yellow, and dotted with India Ink. 
Bakewell defines this rock to be “slate containing tale,” 
ema 2s 491,) and Eaton calls it “that kind of mica slate 
ich is distinguished from mica slate by a kind of talc 
eee »* Tn this term I do not include soapstone. 
There is but one stratum of this rock in the region of the 
map, of sufficient extent to render it necessary to delineate it. 
I have sometimes noticed on the east side of Connecticut. 
river a kind of talco-micaceous slate: but not in. a 
and rarely in place. T have crossed the u | 
colored on the map in Whitingham, Vt. where it is not less 
than a mile and a half in width. Ihave traversed it also in 
tlawley and Plainfield, and Professor Eaton says it extends 
into Worthington—-so that on his authority I have extended 
it thither, T e rock is of a much lighter color than mica 
slate. Ata distance, indeed, it has the aspect of gneiss. 
The tale is nearly white, though sometimes of a light green, 
and it contains.a large proportion of silex. ‘The strata are 
but little undulating and nearly perpendicular, leaning a few 
degrees to the west. On its east side, where it passes into 
mica a slate, an intermediate talco-micaceous rock is found, 
containing numerous distinct crystals of black hornblende, 
ihrown in promiscuously, and exhibiting the most elegant 
specimens. One variety hasa ground that is green; anoth- 
er has a white ground, and the contrast between these and 
the imbedded crystals is striking. Large slabs of this rock 
may easily be obtained; and if it will admit of a polish, it 
would certainly be a bea uutiful addition to those marbles and 
porphy ries that are wrought for ornamental purposes. The 
varieties of this rock may be seen in any direction a few 
rods from the meeting house in Hawley; as likewise many 
