underlying gneiss shows signs of polishing. As elsewhere 
about Philadelphia the gneiss is decomposed, and some of the 
decomposed portion has been mingled with the lower strata 
of the gravel. At many localities in the vicinity the gravel 
may be seen lying on very uneven surfaces of gneiss quite 
unlike the floors beneath true till. 
(8.) Professor Prime has very naturally confounded the true 
moraine at Bangor and Ackermannville with the Kame which 
runs through Williamsburg (Mt. Bethel) and Bangor.”* The 
topographical features of kames and moraines are very similar, 
and without a special examination of their internal structure 
are liable to be confounded. 
(9.) The supposed moraine in the Saucon valley is merely a 
deposit of stratitied drift, similar to those already described on 
_ the Lehigh and at Philadelphia. The bowlders are water-worn, 
not scratched, and lie at an elevation less than 180 feet above 
the river at Bethlehem. 
the valley of the Susquehanna, southwest of Berwick. But 
the absence of typical till, of strize, and of moraines, and the 
fact that the deposits south of the terminal moraine are limi 
to districts below a fixed elevation, serve to distinguish them. 
I do not here include that, as yet, unexplained phenomenon 
which, more clearly shown in the western part of the State, I 
have called ‘the fringe.” 
s to the glacial strise in Lehigh County, Professor Prime 
has admitted to me that his reference to them was due to & 
mistaken observation. : 
e only evidence upon which Professor Carll rests bis 
conclusion as to the northward flow of a McKean County 
glacier, appears to be" the occurrence of pebbles and bowlders 
of the red rocks of the Mauch Chunk (XI), Pocono (X) and | 
15 -y, Report Z, p. 52, 53, 62. 1® Report III, p. 379. 
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