PLEISTOCENE MARINE SUBMERGENCE 6l 



delta seems to head. The waters lay here and among the detached 

 hills at an altitude of 745 feet for the closing phase, but the plains 

 recording the earlier and uplifted levels are about 770 feet. No 

 study has been made of this area. 



The marine waters did not reach this quadrangle. 



Antiverp quadrangle. On the southern part of this area lies the 

 greater mass of the huge delta of the Black river built in Lake 

 Iroquois. The head of the delta lies south, up stream, on the 

 Carthage quadrangle. The theoretic altitude for closing Iroquois 

 in the district of the Great Bend is 700 feet, and the broader plains 

 are • contoured at 700. The higher plains, about Carthage are up 

 to 740 feet. The history of the waters in this region is told in 

 publications 162 and 163. 



The marine waters did not reach this area; but had irregular 

 extension among the hills northward, on the Hammond quadrangle. 



The accompanying map, plate 4, gives the approximate location 

 of the shore lines on the quadrangles which are not reproduced for 

 this writing. 



Ontario Basin 



Lake Iroquois. West of the St Lawrence area, above described, 

 the beaches of Lake Iroquois and of the sea-level waters have 

 been described and mapped in former publications. The beaches 

 of Iroquois were the first of the ancient shore lines to be dis- 

 tinctly recognized as such, and are too well known in the Ontario 

 basin to require extended notice here. The more important papers 

 have been listed in the bibliography. The more recent maps are 

 in the following papers : 



In 154 of the appended list, plate 19 is a map of the lake south 

 and west from Watertown; with description of the strong shore 

 from Watertown to Richland, pages 104-12, and tabulated details 

 in plates 9 and 10. 



In 152, a good map by Coleman, with description of the Canadian 

 shore. 



In 163, a part of the Black river delta is shown in plate 44, and 

 described in pages 136-72. 



In 164, plate 17 shows the early stage when the lake had reached 

 its full westward extent, as a narrow stretch of water along the 

 south front of the Ontario glacier lobe. Plate 4 in this paper is a 

 detailed map of the shore line in the Watertown region, from 

 Carthage to Adams, with the channels of tributary glacial drainage. 



Accompanying this paper, plate i shows Lake Iroquois at its 

 greatest expansion, just previous to its extinction; plate 4 shows 



