Geology, &c. of the Connecticut. 229 
that it does not appear to be radiated under a magnifier, 
great or small; but to consist of folia curiously arranged 
often with no regularity and their length somewhat greater 
than their breadth.” 
2. Chlorite Slate. For an account of this, see the map 
and the Geological part of this sketch. 
‘3. Green Earth. A part of the chlorite described above 
in the amygdaloid in Deerfield, &c. appears to belong to this 
variety. 
61. Argillaceous Slate. 
(1. Argillite. 
2. Shale. 
3. Bituminous Shale. For a‘description of these minerals 
the reader is referred to the Geological part of this sketch. 
62. Claystone. This is found in rolled peices in the bed 
of Connecticut river below where it cuts through the coal 
formation at Gill; and probably this mineral is worn from 
thence by the water. The pieces frequently occur in the 
form of a prolate spheroid, sometimes flattened, even to the 
shape of a wheel, and sometimes assuming shapes bearing a 
resemblance to the sculptured images of Persia and India. 
It is opaque——colour, light gray—scarcely adheres to the 
tongue, and yields a slight argillaceous odour—fracture dull 
and uneven,wa ‘little conchoidal—easily scratched with a 
knife and even by the finger nail; y€t its particles scratch 
iron. It does not effervesce with acids. 
63. Clay. 
1. Porcelain Clay. At Washington Ct. in small quantities. 
(Cleaveland.) Also at Plainfield. (Silliman.) Also at Con- 
way and Leyden in small quantities. 
_ 2. Poiters Clay. In the older alluvion along the Connect 
‘cut, abundant. 
