File:The physical geography of New York state (1902) (14592413240).jpg

Identifier: physicalgeograph00tarr (find matches)
Title: The physical geography of New York state
Year: 1902 (1900s)
Authors: Tarr, Ralph S. (Ralph Stockman), 1864-1912 Turner, E. T. (Ebenezer Tousey)
Subjects: Physical geography -- New York (State) Glacial epoch Great Lakes (North America) New York (State) -- Climate New York (State) -- Description and travel
Publisher: New York : The Macmillan company London, Macmillan & co., ltd.
Contributing Library: New York Public Library
Digitizing Sponsor: MSN

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shallow lakes, saline in char-acter through the concentration of the salts furnished bythe water, but no longer removed by overflow and incapableof being removed by evaporation. Such a condition as this exists in many arid lands, nota-bly in Central Asia and our western Great IJasin, in whichone of the basins holds the Great Salt Lake. While thiscondition is now absent from New York, the presenre ..f ex-tensive beds of Silurian salt suggests the possibility that, atthat early period, the supposed conditions of aridity actuallydid exist within the confines of the State; and in the changesof climate which have occurred since then, of which we feelcertain that there have been many, though we cannot specifyeach of them and point out its effects, there may well have been similar changes in later periods; ind 1. others Mill may be in store. SWAMPS.—There are various ways in which swamps maybe formed, but perhaps the common«-t swamp in New York 214 The Physical Geography of New York State
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FIG. 116. Swampy shore of Clay Pond, Bourne, Massachusetts (Fig. 118)(J. L. Gardner, 2d, photographer). is that caused where underground water escapes to the sur-face on a hillside, or at the base of a hill, and finds its run-off retarded, either by the growth of vegetation or by thelevelness of the ground. With the removal of the forestsmany swamps of this kind have disappeared, and their sitesare marked by the presence of a dark carbonaceous soil. Inother cases the supply of water is so great that the mereremoval of trees is not sufficient to drain the surface, andthen, in some instances, artificial drainage has been re-sorted to. Swamps of this kind, although abundant, are small.They are found in great numbers in the morainic country,where the water readily percolates through the stratifieddrift, but is retarded, and even forced to escape to the air,when it reaches the more compact underlying boulder clay.Sometimes a linear swamp is then formed along a part of <nnl titi-timjix -

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