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 (14759441166).jpg

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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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FiG. 40.—Scratched stone from the till of Boston. Natural size about one foot and a halflong by ten inches wide. (From photograph.) ing pitch or lava. But, though it does move, it is not capa-ble of adapting itself so perfectly as a real fluid to the
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J3 O c-5 •E if -a - E « c.2 c £-2 -a o *« S Cfi (U c3 ^/Si a* 03 « c « c O o o SIGNS OF FORMER OLACIATION. 125 inequalities of the country. From this comparatively solidcharacter of ice certain important results must follow. Itis easy to see that the stones of all sizes, while being draggedalong underneath the ice, would be held in a comparativelytirm grasp so as to be polished and striated and scratched ina peculiar manner. On the shores of bays and lakes and inbottoms of streams we tind that the stones are poKshed andIounded in a symmetrical manner, but are never scratched.The mobility of water is such that the edges and corners ofthe stones are rubbed together by a force acting successivelyin every possible direction. But in and under the ice thetirm grasp of the stiff semi-fluid causes the stony fragmentsto move in a nearly uniform direction, so that they grateover the underlying rocks like a rasp, wearing down therocks beneath and slowly grinding them to

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