696 ABSTRACTS OF PAPERS 



in any region by the evidence of the field. When a plain is elevated and sub- 

 jected to erosion, for a time there will be traceable a marked accordance be- 

 tween the level of the higher hilltops; but as all lose a part of their initial 

 elevation, there will arise a maximum discordance of the higher summit levels. 

 This will mark advanced maturity in the erosion cycle. In old age a new ac- 

 cordance will slowly become developed in relation to the lower and younger 

 baselevel. The test, then, of the amount of loss by erosion suffered by the 

 highest remnants of an old marine plain is the degree of accordance of the 

 highest residuals— an accordance to be traced across the strike of resistant 

 rocks and thus shown to be independent of structure. This criterion has been 

 applied from New England to the Potomac River and indicates that it is still 

 possible to rather closely determine the levels of even the terraces most de- 

 stroyed. 



Mr. Darton has mentioned that the Sunderland was largely an estuarine 

 formation. It may also be so regarded in Connecticut, since Long Island must 

 then have existed as a partial barrier to the open sea. Furthermore, all the 

 Pleistocene terraces show the marked character of lapping around headlands, 

 indicating that the land did not stand still sufficiently long after a stage of 

 subsidence for shore erosion to produce a mature shoreline. 



Professor Davis has made the point that the slopes of the hills partly con- 

 sumed by sea erosion should be steeper facing the sea than on the landward 

 side. It would seem that this criterion should be susceptible of application 

 to the Pleistocene terraces, though the initial slopes may be somewhat masked 

 by the effects of glaciation. The test must, however, be made in the field 

 rather than from maps, since these New England maps are in general not 

 faithful enough in regard to the details of slope to enable them to be used for 

 such refined discriminations. 



RECEXT CHAXGES IX THE ASVLKAN GLACIER 

 BY HEINBICH BIES 



(Abstract) 



The Asulkan Glacier is located four miles south of Glacier Station, in the 

 Selkirks of British Columbia. Observations made on it between 1908 and 1912 

 show that it receded rapidly during the first part of this period, but not as 

 much during the latter part. Photographs taken from the same point in suc- 

 cessive years bring out these changes clearly. 



EYIDEXCE OF VERY EARLY GLACIATION IX OHIO 

 BY GEOBGE D. HUBBABD 



(Abstract) 



1. Introduction : Summarizes the results of earlier workers. 



2. Early drift: Describes and discusses some very old drift deposits in Hock- 

 iiiL'. Boss, Pike, and Jackson counties. 



:;. Stream diversions: Describes diversions of various ages. Some of these 

 are quite recent and seem to be connected with the Wisconsin ice-invasion : 

 others are much older and may represent different stages of development, 



