PLEISTOCENE MARINE SUBMERGENCE I3 



5 Evidence from the Connecticut Valley and Long Island 



Plate 3 



The Connecticut valley, like the Hudson, is filled with clay and 

 sand plains, deltas, terraces and occasionally beaches due to deep 

 standing water. The valley held an estuary contemporaneous with 

 the H'udson-Champlain estuary. The facts for the Connecticut 

 valley have been concisely given in a former publication (69), 



The isobases in plate 9 were originally drawn to connect points 

 of equal altitude on the marine shores of the Connecticut and the 

 Hudson valleys ; and they are found to be in accord with all knowl- 

 edge to date. 



An examination of Long Island shows that it was also sub- 

 merged to the extent indicated by the isobases ; and the facts are 

 on record in a recent paper (55). The proofs of Long Island sub- 

 mergence, especially at the eastern end of the island, are so abundant 

 and evident that it seems strange they should have been so long 

 overlooked. 



It will be found that these isobasal lines of plate 9, with some 

 greater curvature, will mark the amount of the Postglacial submer- 

 gence and subsequent uplift of New England and the Maritime 

 provinces. 



6 Postglacial Submergence of New England and Canada 



It is well known that New England and eastern Canada have 

 been elevated since glacial time. The occurrence of abundant 

 marine fossils in extensive areas and far above present sea level is 

 indisputable proof of submergence. But the extent of the sub- 

 mergence has probably not been appreciated, and certainly has not 

 been accurately determined. 



The Canadian geologists have recorded many evidences of stand- 

 ing waters and many localities of marine fossils at high altitudes in 

 the St Lawrence and Ottawa valleys, and eastward, to which the 

 geologists of the United States have not given sufficient attention. 

 The occurrence of marine fossils far over present sea level and 

 other evidences of deep glacial and postglacial submergence caused 

 the Canadian geologists to place some overemphasis on the work of 

 floating ice and icebergs in explanation of the glacial phenomena. 

 . But it must be admitted that in the fact of deep marine waters over 

 eastern Canada the Canadian students had very good basis for their 

 ice-flotation theory. 



The recognition of the work of the Labradorian ice sheet over 



