Tje 



ROLLIN D. SA LI SB UR V 



from the north. But may not the shells which are found be 

 accounted for in some other way ? The real question is, not 

 how the shells in the till might have reached their present posi- 

 tion, but how they did reach it. If Great Britain was glaciated 



Fig. 3. — Profile of end of a glacier, near the head of McCormick Bay. 



by ice from the northeast, its eastern and northern coasts should 

 show the topographic features which characterize the stoss side 

 of a land mass. The application of this criterion might be diffi- 

 cult, since the supposed continuity of glaciation is referred to 

 the earlier ice epochs, the work of which has been obscured or 

 obliterated by later glaciations, as well as by other processes. 

 It is meant here simply to raise the question whether the evi- 

 dence for continuous glaciation from Scandinavia to Great Britain 

 does not need re-examination. Are the phenomena such as to 

 preclude other explanations ? 



