658 CHARLES EMERSON PEET 



may have been true under either origin of the water body, and must 

 have been true under the estuarine hypothesis. The early history 

 of this Avater body was in part contemporaneous with that of Lake 

 Passaic/ but the latter lake had disappeared before the Newark 

 Bay water body had attained its greatest dimensions. When the 

 Newark Bay water body disappeared, the floor was exposed as a 

 broad stretch of plain partly covered with sand, through which the 

 Passaic-Hackensack River took its course and was joined east of 

 Shooter's Island by the extended course of Elizabeth River. From 

 the sands of this Newark Bay lake-floor the dunes which occur on 

 the west side of Newark Bay at various places were made.^ If the 

 peat under this sand is a salt marsh accumulation, as Professor 

 George H. Cook thought, the interpretation must be altered accord- 

 ingly. 



RELATION OF HUDSON WATER BODY TO LAKE IROQUOIS. 



The delta of the Mohawk River in the Hudson water body is 

 reported at 340 feet above tide.^ If this was made at a time when 

 Lake Iroquois was draining out through the Rome outlet, it shows 

 that the Hudson water body had a level lower than Lake Iroquois, 

 by an amount, however, not necessarily the same as the present 

 difference between the Lake Iroquois level and the delta level. 



If Higher Glacial Lake Champlain was inaugurated before the 

 ice retired beyond the Adirondacks, then here is the only opportunity 

 to determine the relation between the levels of Lake Iroquois and the 

 Hudson or Hudson-Champlain water body. If Higher Glacial Lake 

 Champlain was not inaugurated until after the ice retired beyond the 

 Adirondacks, then the waters of Lake Iroquois must have fallen to 

 the level of Hudson-Champlain, and subsequently had the same level 

 as that of Higher Glacial Lake Champlain on the uphft of the 

 barrier south of Fort Edward. The weight of the evidence, however^ 

 is against this succession of events. 



1 See RoLLiN D. Salisbury and Henry B. Kummel, "Lake Passaic: An Extinct 

 Glacial Lake," Annual Report of the State Geologist of New Jersey for 1893, pp. 225-328. 



2 See Geology of Nezv Jersey, 1868, p. 228, and Annual Report of New Jersey 

 State Geologist, 1893, p. 205. 



3 A. P. Brigham. 



