File:The geology of New Hampshire - a report comprising the results of explorations ordered by the legislature (1874) (14597926947).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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lls, and the direction taken by theseslopes, have been determined by the glacial current, which produced thestriae with which they are parallel. Slopes of till accumulated on the lee side of projecting ledges havebeen described by European glacialists, the hill and the detritus shelteredbehind it being commonly known as crag and tail. The greater por-tion of these slopes which have been noted in New Hampshire are shel-tered in this way; but about a third of them lie upon the northern side,which was exposed to the ice-current. In rare cases these slopes havegathered upon both north and south sides alike, blending together andassuming the form of a lenticular hill of glacial drift, but having expos-ures of ledge at the top. In many true lenticular hills outcrops of solid Natural History by Prof. N. S. Shaler (vol. xiii, pp. 196-203), and by Prof. C. H. Hitchcock (vol. xi.v, pp.63-67). They seem to resemble the drums or sowbacks of the till in Scotland, mentioned in GeikiesGreat Ice Age.
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GLACIAL DRIFT. 289 rock occur near their base, and evidently form a pedestal capped by arounded mass of till fifty to one hundred feet in depth. These hills of glacial drift may be recognized by their smoothed sur-faces, overspread, indeed, with the large boulders which are common inthe upper till, but moulded in gracefully curved outlines unbroken byjutting ledges, which give to all our other hills a more or less angularand abruptly undulating surface. Our elevations of rock are commonlyin irregular groups or ridges, with outlying spurs, and, except in thesouth-east part of the state, they are far more massive and prominentthan the lenticular hills. These accumulations of till are further distin-guished by their fertile soil, well adapted for pasturage or cultivation,which frequently makes them the most valuable land in the districtswhere they occur. On this account, they have almost invariably beencleared, while the more rugged, ledgy hills remain covered with woods. During explorat

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