446 PLEISTOCENE OF INDIANA AND MICHIGAN. 



were inevitable. The duration of the Kirkfield stage was relatively long and the uplifts were 

 spasmodic and not steady and even. From the beginning of Early Lake Algonquin to near the 

 close of the Kirkfield stage no uplift occurred, so far as known. As the facts now stand, no 

 satisfactory interpretation of the Algonquin channel between Peterboro and Trenton has been 

 found. 



If the supposed extension of the channel to Trenton is correct, it introduces a problem of 

 much difficulty and seems to suggest an oscillation of the ice front even greater than that which 

 preceded the building of the Port Huron morainic system. It does not seem possible that 

 this episode of the lake history can be settled until more field studies are made. 



Coleman's conclusion that the waters were backed up on the southern and western shores of 

 Lake Iroquois by the uplift is confirmed by well-defined remains of an early Iroquois strand 

 found by the writer north of Lockport and 32 feet below the main Iroquois beach. 1 



1 Niagara folio (No. 190), Geol. Atlas U. S., U. S. Geol. Survey, 1913, p. 12 and surficial-geology map. 



