. Bulletin of the Proceedings of the National Institute for the Promotion of Science. THE NATIONAL INSTITUTION. 197 COMMUNICATED BY S. WEBBER, M. D. Sketch of the great Geological Features of the Valley of Connecticut River, at Charlestown, , and Remarks on some Crystals found in the Slate-rock scattered in that region ; with specimens. The valley of the Connecticut river, in its widest extent, may be said to be in. eluded between the summits of the Green Mountains of Vermont on the west, and those of the granite ridgo, forming the height of land between it and the valley of the
. Bulletin of the Proceedings of the National Institute for the Promotion of Science. THE NATIONAL INSTITUTION. 197 COMMUNICATED BY S. WEBBER, M. D. Sketch of the great Geological Features of the Valley of Connecticut River, at Charlestown, , and Remarks on some Crystals found in the Slate-rock scattered in that region ; with specimens. The valley of the Connecticut river, in its widest extent, may be said to be in. eluded between the summits of the Green Mountains of Vermont on the west, and those of the granite ridgo, forming the height of land between it and the valley of the Merrimac, on the east. From the edges of the proper valley in which its waters flow, there is a continual though broken rise to these great boundaries, from whose sides flow the tributary streams of the river. The immediate valley is bounded by a steep ridge of hills on either side, between the feet of wliich and the river spreads an extent of fertile meadow ; the deposit of the river, through which it winds its way, alternately approaching to and receding from tliese ranges of hills. The nucleus and substance of tliese hills in Charlestown, consists of strata of argillaceous slate, up. turned nearly perpendicularly, the direction of the strata being nearly north and south, and the dip a little to the south of east. On the east side, passing over the summit of this first ridge, there is a slight valley, beyond which rises a ridge of granitic structure, seeming as if forced up through the chasm made by the depres- sion of the eastern edge of the slate strata forming the first ridge, and holding them in place by its pressure on the inverted edge and sloping surface. Somewhat the Jiamc arrangement is to be found on the western side. The following is a sketch:. A n I Strata of slate. C C. Granite ridges. d d. Earth and coarse gravel forming the outer surface of the hills, in many places stratified, and resembling the deposits in the bed of a river. e e. Meadows or interval land, co
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