28 NEW YORK STATE MUSEUM 



trict exceeded the rise of the water level by the 62 feet of vertical 

 spacing. The relatively stationary attitude of the lake after the 

 Covey outlet became effective gave the wave of land uplift the 

 opportunity of rising out of water. It may be noted, as illustration 

 and proof of the wave movement that during glacial (Iroquois) 

 time Rome was lifted iii feet more than Farr's, but that during 

 Post-Iroquois (Postglacial for New York) time Farr's rose 211 

 feet more than Rome. In way of summaiy, it may be stated that 

 south of Rome, which was on the fulcral line for nearly all the life 

 of Iroquois, all the beach phenomena appear to an effect of rising 

 water; that north of the fulcral line the splitting of beaches declines 

 in amount both toward and beyond Watertown; that the tabulated 

 figures for the Canadian stations show similar relation; and that 

 the splitting of the bars is due to a local uplift of the ice-unloaded 

 territory during the relatively short period that the lake outlet was 

 at Covey pass. 



The south shore of Lake Iroquois has the characters produced 

 by a rising water level. Evidently the rise of the lake surface was 

 produced by the excessive rise, or differential uplift, at the outlets, 

 especially at Rome. The huge gravel bar at Hamilton is the mo.^t 

 striking feature due to the rise of the lake. This has been described 

 by Coleman (151, pages 351-52), who implied that the flooding by 

 the rise of the lake level was toward 100 feet. Our tabulation 

 shows that while Rome was lifted 180 feet, Hamilton was lifted only 

 123 feet, and the flooding at that point was 57 feet. It is an inter- 

 esting fact that " unworn Mammoth remains " were found in the 

 Hamilton bar at a depth of 83 feet (151, page 352). 



By similar calculation the approximate amount of flooding is 

 estimated for other stations. The figures are maximum, and prob- 

 ably slightly excessive, being as much above the fact as the uplift 

 at Rome, after the outflow was shifted to Covey, exceeds the rise 

 at Covey. As this difference is unknown, but probably small, the 

 comparison of stations is made with Rome. 



The beaches in Canada show relations similar to those in New 

 York. The figures are chiefly Professor Coleman's. Toronto, on 

 nearly the same isobase as East Gaines with about the same rela- 

 tion to the ice body, has similar figures, the glacial uplift being 

 two-fifths of the total. But Quays, on the same isobase as Rome, 

 but much longer under the weight of the glacier, received less than 

 one-fourth of its rise in glacial time. The district north from 

 Quays shows declining glacial uplift and increasing postglacial, 

 similar to northern New York. 



