60 PROCEEDINGS OF- THE WASHINGTON MEETING 



kettle shows that a large portion of the drift-buried ice block, which produced 

 the basin of Round Lake, persisted until the locality had been raised 175 feet, 

 the total Pleistocene uplift being 375 feet. 



Differential uplift diverted the Iromohawk flow from its northward course, 

 as mapped by J. H. Stoller, into the present Mohawk channel. 



Presented in abstract extemporaneousl}'. 



PLEISTOCENE VPLTFT OF NEW YORK AND ADJACENT TERRITORY 

 BY HERMAN L. FAIRCHILD 



(Abstract) 



The paper published in the Bulletin, volume 25, pages 219-242, was intended 

 to emphasize the fact of deep submergence in sealevel waters of the Con- 

 necticut and Hudson valleys. With further study of the marine plane and 

 with precise levels on the international boundary, it is now possible to locate 

 with approach to accuracy the isobases of land uplift across New York and 

 the adjoining areas, east and west. 



A fixed vertical relation in the Ontario basin between the Iroquois and the 

 marine planes give us a key, for the Iroquois area, to (1) the amount of post- 

 Iroquois uplift; (2) of Iroquois or glacial uplift; (3) of initial altitude; (4) 

 of local warping; (5) of flooding, due to differential uplift of the Rome outlet. 



The uplifting of the area, in time and amount, shows very close relation to 

 the latest ice-body, and the uplifting appears to have been a progressive wave, 

 subsequent to the far removal of the ice. 



Presented in abstract extemporaneously. 

 Published in full in this volume. 



Discussion on the two preceding Papers 



Frof. J. W. Spencer : Some years ago I devoted much time in the study of 

 the terraces of New England, but only published a note on them. From the 

 highlands of northern New England extensive terraces, sometimes 20 miles 

 long, were found to occur in all the great valleys, with slopes much less than 

 the gradients of the rivers. These terraces descended not in warpings, but 

 by steps (overlapping one another) ; not merely to the south in the Connecticut 

 Valley, but westward down the Lamoille, eastward down the Saco, northward 

 in the valleys leading to the Saint Lawrence. Consequently, if they were due 

 to the rise of the mountain mass, there should be some agreement between the 

 terraces of the different valleys. If such had been the case, the movements 

 were per sal turn in steps and not by warping curves. This does not support 

 the hypothesis of Professor Fairchild. that the Connecticut terraces record the 

 warping. Also long ago I found that the Iroquois beach extended east of 

 Watertown, and correctly traced it to East Pitcairn; but in 1902 Professor 

 Fairchild terminated late Iroquois some 20 miles within the explored zone, as 

 shown on his map. 



Prof. R. D. Salisbury : We can congratulate ourselves on the fact that 

 Professor Fairchild has been able so long to follow up his studies on glacial 



