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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uclei of those islands certainlv existed before theGlacial period, for at Gay Head, on Marthas Vineyard, andin the vicinity of Port Jefierson, on Long Island, and atsome other places, there are extensive beds of Tertiary clayunderlying the glacial deposits, and rising above the water-level. The glacial deposits simply form a capping of moreor less thickness to these older ones. It is still true, however,that the glacial deposits have determined, in the main, thepresent topographical features. In following the moraine across New Jersey, we find thatbeginning at the sea-level, its base rises to a height of morethan a thousand feet, where it crosses the Blue Hills ofwestern New Jersey; and everywhere its surface is character-ized by the knobs and kettle-holes, whose manner of for-mation has just been explained. Crossing the Delaware River, these characteristic phe- * Report upon The Drift Formations of the Northwest, inSmithsonian Contributions to Knowledge 1866 fSee above, p. 57 et seq.
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