File:The geology of New Hampshire - a report comprising the results of explorations ordered by the legislature (1874) (14804261933).jpg

Identifier: geologyofnewhamp35newh (find matches)
Title: The geology of New Hampshire : a report comprising the results of explorations ordered by the legislature
Year: 1874 (1870s)
Authors: New Hampshire. Geological and Mineralogical Survey Hitchcock, Charles H. (Charles Henry), 1836-1919 Upham, Warren, 1850-1934 Huntington, Joshua Henry, 1833-1904 Quimby, Elihu T. (Elihu Thayer), 1826-1890 Scudder, Samuel Hubbard, 1837-1911 Flint, William F Edwards, Arthur M. (Arthur Mead) Hawes, George Wesson, 1848-1882
Subjects: Geology Rivers Insects Botany Fragilariaceae Drift Mineralogy Physical geography
Publisher: Concord : E. A. Jenks, state printer
Contributing Library: University of New Hampshire Library
Digitizing Sponsor: University of New Hampshire Library

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The noticeable features of the valley in this distance are, that it is deepand narrow, with sloping sides of till, and destitute of the level alluvialterraces and intervals which occupy a large width everywhere else alongthe river. Where any modified drift does occur, it is coarser than usual,being generally gravel, sometimes imperfectly rounded or water-worn, andits surface has commonly an irregular slope. The upper portion of theserapids is especially destitute even of such alluvial deposits, the highest•that occur being from 60 to 75 feet above the stream. It is frequentlyevident that the source of these deposits is not the main river, but a trib-utary, as in the case of Niles stream in Concord, Vt., and on both sidesat Upper Waterford. These deltas are greater in height, as well as inamount, than the scanty remnants of the alluvium of the main valley. On the lower portion of these rapids the modified drift appears ingreater quantity and at a much increased height. Opposite Lower
Text Appearing After Image:
MODIFIED DRIFT ALONG CONNECTICUT RIVER. 2$ Waterford we find irregular hillocks of sand, barren of vegetation, anddrifted by the wind, the highest of which are about 200 feet above theriver. Below this point the modified drift rises in irregular slopes to aheight of 200 feet in several places, and its position shows it to have beenprincipally deposited from currents of the main valley. As we approachthe foot of the falls its coarse character is changed, and sand predomi-nates in the place of gravel. These deposits probably once filled thispart of the valley nearly 200 feet above the present river, sloping in sixmiles between Lower Waterford and Passumpsic river from about 800 to650 feet above the sea. The course of the river along Fifteen-miles falls is S. 70° W., beingturned much to the west from its general direction. This course is atright angles to the line of motion of the great ice-sheet; consequentlythis valley was sheltered from the direct grooving and rasping of the ice,and

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