656 CHARLES EMERSON PEET 



Hudson water body, unless those drawn from the phenomena on the 

 outside of the moraine be such, it is hkewise true that the facts are 

 not fatal to the lake hypothesis, unless the sponge spicules reported 

 from Croton represent salt-water species.^ Aside from these sponge 

 spicules, the weight of the evidence seems to be in favor of the lake 

 hypothesis. 



RELATION OF HUDSON WATER BODY TO THE CONNECTICUT VALLEY 



WATER BODY. 



If the Hudson water body was an arm of the sea, there is no need 

 of discussing the relation between the Connecticut Valley deposits 

 and those of the Hudson more fully than they have already been 

 discussed. It is enough to repeat here, what has been said before 

 (p. 651), that in order to account for the absence of life certainly 

 marine in the Hudson, on the hypothesis stated above (p. 650), it 

 seems necessary to postulate a higher altitude of the land at that 

 time at the east end of Long Island Sound, so as to shut out free 

 access of salt water to both the Connecticut Valley and the Hudson 

 Valley. 



If the Hudson water body was a lake, it does not necessarily 

 follow, of course, that the Connecticut Valley deposits accumulated 

 in a lake. This explanation is given for these deposits in Massachu- 

 setts.^ It is true nevertheless that a southern uplift somewhat more 

 than that necessary to make Hudson Lake would equally well account 

 for the phenomena of the Connecticut Valley. So far as published 

 accounts indicate, there is little, if any, clay of late glacial age, outside 

 of the area north of Long Island Sound, which could not be explained 

 as having accumulated either in local lake basins, or in the sea when 

 the land at the north was depressed enough to submerge the clay 

 areas along the eastern New England coast. This northern depres- 

 sion is not incompatible with the southern uplift which would produce 

 a lake in Long Island Sound and in the valleys and lowlands north 

 of it. If Long Island and the land to the east were high enough to 

 make a lake north of it, either from the start or later on, this water 

 body was divided into several parts. 



1 See footnote, p. 649. 



2 See Emerson, Monograph XXIX, U. S. Geological Survey, Chap. 19. 



