File:The ice age in North America and its bearing upon the antiquity of man. 5th ed. with many new maps and illus., enl. and rewritten to incorporate the facts that bring it up to date, with chapters on (14595818019).jpg

Identifier: iceageinnorthame00wriguoft (find matches)
Title: The ice age in North America and its bearing upon the antiquity of man. 5th ed. with many new maps and illus., enl. and rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation
Year: 1911 (1910s)
Authors: Wright, G. Frederick (George Frederick), 1838-1921 Upham, Warren, 1850-1934
Subjects: Glacial epoch Glaciers
Publisher: Oberlin, Ohio Bibliotheca Sacra Co
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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vel. Eastward from Buffalo portions of this serieshave been traced, according to Gilbert, until they disappearagainst the highlands near Alden, on the Erie Railroad. Lake Ontario is likewise bordered by similar ridges uponits southern and eastern sides, but the investigations in thatregion aje not yet complete enough to be altogether satisfac-tory. From what has already been done it is evident thatthey do not maintain so nearly a uniform level as on theshores of Lake Erie. Mr. G. K. Gilbert, of the Ignited StatesGeological Survey, infoims me that, from the vicinity ofOneida Lake toward the northeast, the ridges rise rapidlywith reference to the lake-level, and that to a less extentthey rise in a westerly direction, showing that if they werewater-deposits, there has been considerable oscillation of theland both northeast and southwest of an axis following: theline of the Mohawk Valley. That the ridges on Lake Erie mark temporary shore-lines * Geological Survey of Ohio, vol. ii, p. 207.
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s> &q 1) o -So^S « C £W.a ■ fl o& o.2 g ^& U o ■- o -*^ 0) C3 O a GLACIAL DAMS, LAKES, AND WATERFALLS 397 of the lakes can not well be doubted, for thej are not relatedto any great natural lines of drainage, but follow the wind-ings of a definite level, receding from the lake whereverthere is a transverse valley, and forming in some cases parallelembankments on either side of such valley, running inlandas far as to the general level of the series, and then return-ing on itself upon the other side, to strike off again par-allel with the shore at the same level. Their relation to thelake is also shown by the local character of the material. It isusually such as would wash up on the shore out of the rock inplace. In the sandstone region the ridges are largely madeup of sand, mingled with fragments from the general glacialdeposit. Over the regions of outcropping shales the ridgesare composed largely of the harder nodules which have suc-cessfully resisted the attrition

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