THE JOURNAL OF GEOLOGY. 



sented. The earlier episodes (to use a term not in controversy) 

 may have representatives there in overridden and buried depos- 

 its, but, if so, they are obscure and have not been distinctly 

 delineated. In the West, on the other hand, a very considerable 

 series of episodes is well displayed. These embrace not only 

 those presented in New England, but a considerable series of 

 earlier ones not at all (distinctly) represented there. These 

 greatly prolong and diversify the glacial series. In our judg- 

 ment, it is not simply a doubling of that of New England, but a 

 much higher multiplication. The whole series cannot, there- 

 fore, be judged by the incomplete New England representa- 

 tives. All investigators, we think, or nearly all, agree that the 

 New England glacial deposits fall within a relatively brief epoch 

 and are not much (at least not very distinctly) differentiated. 

 We agree heartily with those who would refer the declared New 

 England drift to one epoch (reserving opinion, of course, regard- 

 ing remnants of overridden or obscure drift of earlier episodes). 

 New England is little better fitted to be a standard for the inter- 

 pretation of the whole glacial series than it is for the whole 

 Palaeozoic series. In neither case is the series fully and dis- 

 tinctly represented, nor in either case is it typical. This is 

 implied significantly in the relative state of delineation of the 

 formations in the eastern and western sections. With a great 

 preponderance of workers and of skill, no historical divisions of 

 the glacial formations have yet been traced entirely across New 

 England, not even those of an episodal rank. In the interior, on 

 the other hand, something like a score of historical stages have 

 been delineated over broad areas. Lines of episodal delimita- 

 tion aggregating many thousands of miles have been mapped. 

 Any attempt, therefore, to revise the work of the interior by the 

 phenomena of New England is not likely to be more successful 

 than the revision of the Palaeozoic series on a like basis. 



In classifying personal opinions, a dividing line separating 

 the New England and the western workers is valuable and sig- 

 nificant. But a much more significant cleavage plane, we think, 

 may be found between those glacialists who have studied the 



