File:Forest physiography; physiography of the United States and principles of soils in relation to forestry (1911) (14590350530).jpg

Identifier: forestphysiograp01bowm (find matches)
Title: Forest physiography; physiography of the United States and principles of soils in relation to forestry
Year: 1911 (1910s)
Authors: Bowman, Isaiah, 1878-1950
Subjects: Physical geography Forests and forestry Soils
Publisher: New York, J. Wiley & sons (etc., etc.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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o the Mohawk. Elevation under 360 feet. A number of intermediatestages are omitted from this series. The three stages shown here are of chief importance. (AfterFairchild, Bull. N. Y. State Mus.) escaped southward, but at later stages the water of the broad areacollected here mainly into two large lakes, one of which occupied thelarge low central valleys of Seneca, Cayuga, and Keuka, with an outletto the Susquehanna, and another in the Genesee Valley region whichescaped by a different route to the Susquehanna, Allegheny, and Mis-sissippi. In a later stage of development and before the beginning ofthe extensive spur channeling so prominent in central New York, thesetwo bodies of water were united into one extensive lake overflowingwestward into the Mississippi drainage above 900 feet and eastward tothe Hudson below that level. A study of the channels which drained the valleys of the separatelake waters through a single outlet shows that they lie in series falling 714 FOREST PHYSIOGRAPHY
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LOWLAND OF CENTRAL NEW YORK 715 northward on the theory of a receding barrier, though not as controlledby a steady continuous single recession of the ice front but by anoscillation of the ice front and a certain amount of seesawing betweenBatavia and Syracuse.^ Typical features of the channel series may be seen at Spread Rockand Jamesville and on the meridians of Mumford and Rush, etc. Theywere carved directly in front of the ice, and in such a position that the

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