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 (14595798558).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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, especially, did, of a bordering fringeof sporadic glacial deposits extending some distance farthersouth than the line as marked on our map. The study ofthis was taken up later by Professor Edward H. Williams andcarried on across the state with the result that the boundaryof the fringe or attenuated border was found to extendon an average, about twenty miles farther south than ourterminal moraine. Similar results were found to prevailin New Jersey by Professor Salisbury, Professor A. A. Wright,and myself. To be specific: The extreme glacial limit in New Jerseyreached to an irregular line running from Bound Brook, aUttle south of Plainfield, to Riegelsville, on the Delaware, afew miles south of Easton, Pa. So far, land-ice evidentlyextended at one time. The striated bowlders found by Profes-sor Salisbury and others still farther south were doubtlesscarried by floating ice when the land was depressed to theextent of about 200 feet, of which evidence will be given ina later chapter. o c
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BOUNDARY OF THE GLACIATED AREA. 153 In Pennsylvania it is interesting to note that the Alpineplant Sedum Rhodiola, long known to exist in the narrows ofthe Delaware River south of Riegelsville, marks the boundaryof the attenuated border in the extreme east. Thence theline skirts the Triassic areas on the south side of the DurhamValley, just south of Bethlehem, turns westward to the Schuyl-kill at Berkeley a few miles north of Reading; thence north-ward on the east side of the Schuylkill River to Shoemakers-ville and going over the Blue Ridge Mountain in a zigzagline, passes through Jacksonville and Kepner to Tamaquawhere it crosses the Schuylkill. Thence running westward itcrosses the Little Schuylkill at Wetherill Junction four milesfrom Pottsville depot, thence westward through Ashlandand Shamokin to the Susquehanna River a few miles southof Selins Grove. West of Pennsylvania this attenuatedborder assumed greater and greater proportions, attaining itslargest extent in northeastern K

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