TABLE SPAR. 



periinents which I have had occasion to make with 

 this mineral, L am induced to consider the water as 

 accidental. I have examined very pure specimens 

 of Table Spar, which did not contain any at all." 



Geological and Mineralogical notice of a portion of 

 the North- Eastern part of the State ofNeiv- York. 

 By Augustus E. Jessup. Read March 19, 1822. 



On the eastern, and a considerable part of the west- 

 ern shore of Lake Champlain, as far north as Bur- 

 lington in Vermont, shell Limestone is the only rock 

 that appears ; hence, I am induced to believe, that 

 the bed of the lake rests on the Secondary or Floetz 

 formation. This rock extends in some places four 

 and five miles from the lake on the eastern side, but 

 is seldom found to extend more than a few paces from 

 its western shore : it abounds with fossil reliquiae ; 

 such as Terebratulites, Encrinites, Orthoceratites, 

 and Corallines. Its colour is generally bluish-gray. 

 To the west, it appears to rest on the Primitive, and 

 I think, also to the east. JVIy reasons for supposing 

 it to rest on the primitive, on the Vermont shore of 

 the lake, are the following : 1st. That many of those 

 minerals which occur in the vicinity of the western 

 shore of the lake, are also found imbedded in the 

 same rocks near the eastern shore. 2nd. Near 

 Crown Point in New- York, are very extensive beds 

 of magnetic oxide of iron, and the same variety is 

 also found north-east of this, near Vergennes in Ver- 



