DIVERSITY OF THE GLACIAL PERIOD 



773 



and subaerial erosion of very considerable 

 extent. The land probably stood some- 

 what higher than at present. Much ero- 

 sion occurred on the north shore, but it is 

 hardly believed that the whole of the ero- 

 sion of the deep re-entrant valleys can be 

 referred to this period, 



Wisco7isi?i. — This period is represented 

 on Long Island by two sharply defined 

 terminal moraines and the accompanying 

 ground moraines and outwash plains. The 

 two terminal moraines exhibit some little 

 shifting of the ice lobes, the younger one, 

 as pointed out by Woodworth,^ crossing the 

 older one near Lake Success. This is quite 

 in accordance with the dual character of 

 the Wisconsin worked out by Leverett^ in 

 Ohio with its shifting of the ice lobes. 



RESUME AND CONCLUSIONS. 



Having presented briefly such facts, as 

 have immediate bearing on the question in 

 hand, the following resume and statement 

 of conclusions is pertinent. In this the 

 several epochs are treated in ascending 

 order, beginning with the oldest, the scheme 

 of classification shown on p. 766 being fol- 

 lowed : 



I. The Pensauken has not been recog- 

 nized on the New England islands, but its 

 outcrop on Long Island near the Jameco 

 gravels makes it possible definitely to refer 

 the "first glacial" of Woodworth to a stage 

 younger than the main body of the extra- 



^ Loc. cit., p. 642. 



'Frank Leverett, Monograph U. S. Geological 

 Survey, Vol. XLI (1902), pp. 41, 352, 353. 



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