LAKE WARREN'S CORRELATED MORAINES. 53 



basin* Several questions suggested by the features of this outlet will 

 have to await further investigation. 



CORRELATED MORAINES. 



The Saginaw moraine bends gracefully around the west side of the bay 

 and extends north-northeast parallel with the shore to the Au Sable river, 

 but after crossing this to the north side it turns to the northwest. From 

 Harrisville and Alcona another high rugged moraine runs away to the 

 northwest, rising gradually. This is the Alcona moraine, and from a 

 point six or eight miles north of Alpena another moraine runs up along 

 the shore in the same direction and is called the Hagenville moraine. t 

 Leverett has worked out the moraines that border the south side of lake 

 Erie and has carried his explorations into western New York. % The 

 wide interval between his Cleveland and Hamburg moraines suggests the 

 presence of another unidentified member between these two, but taking 

 his series as it now stands, the Lockport moraine in New York corre- 

 sponds to the Alcona moraine in Michigan and was contemporary with 

 it. If Leverett's series omits one, then his Lockport moraine would be 

 the correlative of the Hagenville moraine of Michigan. One or the other 

 of these Michigan moraines with the Lockport or the Albion moraine of 

 western New York probably held up the last stage of lake Warren. The 

 northward ends of the Forest beach, however, have not yet been deter- 

 mined either in Michigan or in Ontario, but while definite correlation 

 has not been made with any moraine in the Huron basin, many obser- 

 vations made by the writer in the north in recent years seem to show 

 that none of the Erie-Huron beaches extend beyond the central part of 

 lake Huron. None of them reach to the Michigan or Superior basins 

 nor to Mackinac straits or the shores of the North channel. 



Lake Saginaw. 



du plain beach. 



When the ice-front stood at the Port Huron-Saginaw moraine and the 

 T}'re-Ubly outlet was in operation, that part of the Saginaw valley which 

 lay in front of the ice and below some col, probably in the western part 



* Lake Chicago is a name recently suggested by Mr Frank Leverett for the glacial waters that 

 filled a large part of the Michigan basin daring the retreat of the ice-sheet. It occupied that 

 basin from the time of the first ponding at the south end until the ice withdrew from the straits 

 of Mackinac and allowed the waters east and west to come to one level. During most of its ex- 

 istence this lake received the discharge of the Erie-Huron waters which passed thence to the 

 Mississippi through the Chicago outlet. Three beaches of this lake have been recognized, all 

 leading to the Chicago outlet. This name has been approved by most of the other observers par- 

 ticularly interested in this area, including Professors Chamberlin and Salisbury and Mr Upham. 



fSee "Glacial Succession in Eastern Michigan." Abstract in Am. Geol , Oct., 1896, p. 234. 



X " On the Correlation of New York Moraines with Raised Beaches of Lake Erie," by F. Leverett, 

 Am. Jour. Sci., vol. 1, July, 1895. 



