File:The geology of New Hampshire - a report comprising the results of explorations ordered by the legislature (1874) (14804291803).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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k, forming about one fifth part of the exposure.There are boulders in the till here about a yard in diameter. The sandof North Conway is usually widespread, but very thin. Quite a largemass of it, as long as a small lenticular moraine, occurs just to the southof the stream opposite the hotel. This 4s the position from which thefine view of Mt. Pequawket, employed for the frontispiece of Volume II,was taken. Plant Relics op the Glacial Period. Full descriptions of the Hudsons Bay and Greenland florasnow existing in the White Mountains have been presented in Volume I, pp. 392 and 568. No better argumentto show that an arctic climate once existed in New Hampshire than the presence of these plants, as well as thecorresponding insects described in the same volume, Chapter XII, can be adduced. They also imply the cor-rectness of the glacial instead of the iceberg theory of the drift, and also that the cold conditions spread them-selves gradually over the continent, disappearing slowly also.
Text Appearing After Image:
GLACIAL DRIFT. 285 The Distribution of the Till. By Warren Upham. Before the glacial period, the rocks of New Hampshire had beenthrough long ages subjected to the ordinary disintegrating agencies ofrain and frost. The loose material derived from this source was doubt-less spread with considerable evenness over the surface, collecting to thegreatest depth in valleys, while on ridges or hill-tops it would be thin orentirely washed away. Except where it had been transported by streamsand consequently formed stratified deposits, the only fragments of rockheld in this mass would be from underlying or adjoining rocks. Through this time temperate or tropical climates generally prevailed;but it also seems probable, if the causes of the glacial period have beenrightly made to depend upon great eccentricity in the earths orbit, thatthese genial conditions were at times interrupted by prolonged cold andthe accumulation of slowly-moving ice-fields similar to the immense gla-ciers of Greenland and

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