The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . 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 thickn
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . 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 I •a m t. 03 ;d >>— X S d ?e -S, a;^ o o ^ ^9, to OS l-i •*:> ^5 13 o-a Scattermoralnmuch 0 0) a °fe ?*->^— ^- iM bl c — ^8 ii» T3 tn V >, §,= c 3 C3 F K$ i3 X C 0 **-• C3 E5S. u n Q * S S^.l ^ ^,e -m goo X °1. 0-BT3 B£ InalM wis anSecon 13 Ho|g Si: >> §S bl > 0 c bi ^5^ 302 c - o - T3 02 gsif 146 THE ICE AGE IN NORTH AMERICA. nomena are developed in a marked degree upon the hills ofNorthampton county, Pa., running up to the base of the Kit-tatinny Mountain, some miles below the Delaware Water-Gap. West of the mountain, in Monroe county, the vallevsouth ot Stroudsburg is for several miles tilled with the
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