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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its whole mass. Contained,with the modified drift, in the ice-sheet, and deposited when this melt-ed. Deposited, pp. 13 and 14, by gla-cial rivers at the final melting of theice-sheet, in channels formed uponthe surface of the ice. When thebordering ice-walls and its separatingridges and masses disappeared, thegravel and sand remained in long,steep ridges, or in irregular shortridges and mounds, enclosing bowl-shaped depressions. Kame-like, in having been deposit-ed, pp. 155 and 156, while the adja-cent valleys and lowland were stilloccupied by portions of the depart-ing ice-sheet. Brought down by glacial rivers fromthe melting ice-sheet, filling the val-leys generally to the level of theirhighest terraces. This depositionand the subsequent formation of ter-races required no submergence norchange in the height and slope of theland, pp. 15, 16, and 18. The heightof the sea in the Champlain periodwas about 150 feet above its presentlevel, as .shown by marine shells, pp.18, 165, and 166.
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CHAPTER II. GLACIAL DRIFT. LLUSION has been already made to the former existence of animmense thickness of ice over the whole of New Hampshire, aswell as the entire northern portion of our continent. This ice-sheet issupposed to have been the natural accumulation of frozen moisture fromthe atmosphere, requiring thousands of years* time for its gatheringtogether. Like the similar glacial masses upon both poles of the earth,this one must have been slowly moving towards the equator, especiallynear the melting edge. A formal proof of our statement is unnecessary,since the phenomena presented to us universally over the state speak forthemselves ; and it will be difficult for any one to read an account of thestriation and embossment of the ledges, about to be described, withoutbelieving in the existence of this sheet. As the subject is one of greatinterest, and sound generalizations can be drawn only from observationstaken in every part of the state, much attention has been devoted to theco

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