Dr. Allen on West River Mountain. — 73 
find, at from eighteen to twenty-four feet deep, logs of 
wood and other vegetable substances, in a tolerable state of 
preservation. At the lower end of this plain, and where 
the river was probably once bounded, a quarry of siliceous 
slate appears, which is worked for use in building, &e. ; and all 
interspersed through this, we find bituminous shale and blind 
coal or anthracite, as you will observe by the specimens, with 
frequent pieces of iron pyrites, lenticular spar, erystalize 
quartz, &c. in connexion. Over this, the alluvial deposits 
Yours respectfully, 
MOSES HALE. 
_ Troy, October 6, 1818. : 
wiley ey 
= . 
ae 5 ‘ se ; Se oe . 
Arr. IX.—On the Question, whether there are any traces 
of a Voleano in the West River Mountain—in a letter to 
the Editor from Dr. Jonatuan A. ALLEN. 
West-River Mountain having been announced, in the 
that he 
