Geology, ifc. of the Conneeticuf. 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, Sic. appears to belong to this 

 variety. 



61. .Argillaceous Slate. 



1. Argillite. 



2. Shale. 



3. Bituminous Shah. 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, a little conchoidai — easily scratched with a 

 knife and even by the finger nail ; yet its particles scratch 

 iron. It does not effervesce w.th 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. Pollers Clay. In the older alluvion along the Connect- 

 icut, abundant. 



