BEARING OF THESE STUDIES 97 



Therefore it is highly probable that readvances in the one region 

 were matched by readvances in the other, and periods of recession 

 in the one by those in the other, even if there were some differ- 

 ences in details. 



The first halt and readvance of the ice in New England north 

 of Hartford, Conn., was in central Massachusetts. In the 

 Hudson Valley this zone comes just south of Kingston, which 

 was uncovered about year 4900 (PI. VI). From Kingston the 

 ice edge, as just mentioned, formed a bow towards the northwest, 

 and so the moraines in the Catskills and northwest of them 

 almost surely record the zone of readvance. Between Utica 

 and Syracuse, as seen on the map, there was a wide re-entrant 

 in the ice sheet, while in the lowland of the Finger Lakes pro- 

 truded a big lobe. Accordingly this readvance seems to be 

 traceable the whole distance from Massachusetts to the western 

 side of the Finger Lakes. 



In the Erie and adjacent basins glacial Lake Arkona existed 

 during a pause after a recession of the ice front (Taylor, 1915, 

 P- 375)- The ice barrier is not exactly located; but it stood in 

 about the same position as for Lake Warren, i.e. at the Niagara 

 Falls moraine. Lake Arkona was followed by Lake Whittlesey, 

 which was caused by a marked readvance of the ice (Taylor, 

 191 5, pp. 376 and 384). This ice front is marked by the Port 

 Huron morainic system, which parallels the northeastern and 

 northern coast of the southern peninsula of Michigan 5 to 40 

 miles inland (Taylor, 191 5, PI. 32), and by the Alden moraine 

 south of Buffalo (PI. VI). The moraines have been followed from 

 Wisconsin entirely across the Great Lakes region to the Genesee 

 River in western New York. All facts indicate a general and 

 great change in climate which surely ought to have its correla- 

 tive in eastern New York and New England. The Alden moraine 

 points toward the moraines south of the Finger Lakes, which in 

 their turn ought to have their correlatives in the Great Lakes 

 region. Hence it is exceedingly likely that the Port Huron-Alden 

 moraine, the Finger Lakes moraine, and the overridden clays at 

 Northampton, Mass., correspond to each other. 



