LATER MORAINES OF LAKE MICHIGAN, SAGINAW, AND HURON-ERIE LOBES. 279 



the North Branch transverse channel) became an important line of glacial drainage tributary to 

 the Imlay channel, and the stream that flowed in it appears to have deposited the gravels in its 

 western part. Later, during the life of the East Dayton spillway, the northern part of the La- 

 motte channel was occupied by a stream flowing in the opposite direction (northward). This 

 stream collected the thin sheet of water coming over the flat till plain from the east and guided 

 it to the ice front northwest of Novesta and thence southwest through the East Dayton spillway 

 to Lake Saginaw. If the East Dayton spillway served as an outlet for Lake Maumee its service 

 must have been short, for it does not extend east of East Dayton, unless indeed its continuation 

 there was obliterated by a readvance of the ice to the Juniata moraine. If it was not obliterated 

 by readvancing ice this spillway must have received its waters from a thin sheet of water which 

 came over the divide at the east and south but which did not last long enough to cut the channel 

 back that far. 



Thus the Lamotte channel was originally the headward, ice-bound part of the stream that 

 flowed westward through the North Branch transverse channel. After the ice disappeared its 

 northern part near Novesta probably became a headward northwestward-flowing tributary to 

 the East Dayton spillway and served for a brief time as the outlet of a late stage of glacial Lake 

 Maumee. 



MORAINES OF THE HURON-ERIE SLOPE IN MICHIGAN. 



By Frank B. Taylor. 

 GENERAL, FEATURES. 



The moraines of the Huron-Erie slope in Michigan lie in a belt 20 to 30 miles wide extending 

 southwest from Port Huron and Imlay along the southeast border of Michigan for a little more 

 than 100 miles. Imlay is on the forty-third parallel of latitude and Port Huron is 5 miles south 

 of it. Into the north end of this district the West Branch-Gladwin group of moraines emerges 

 after having passed through the tangle of the interlobate area. Seven or eight individuals are 

 recognizable, but only the first or earliest and one or two later fragments are land-laid. All the 

 rest are water-laid and faint and are traceable with certainty for only short distances. 



The Portland moraine which runs past Hadley turns southeast in the central part of Lapeer 

 County and appears to find a continuation in the Defiance moraine, which runs southeast from 

 Belle River, a few miles west of Imlay. This correlation is not certain and may require revision 

 later but is the best now available. Thus the Defiance moraine appears to stand as the equiva- 

 lent of the earliest part of the West Branch morainic system in the interlobate and Huron-Erie 

 districts, but not in the central part of the Saginaw basin, where there are three earlier ridges. 

 It is considerably stronger than the average individual of the deployed group in the Saginaw 

 Valley. The same'is true of most of the moraines south and southwest of the Defiance in Ohio 

 and Indiana, so that in its general characters it seems more nearly related to them than to the 

 deployed group. Still, the connection in Lapeer County seems fairly clear, and the Defiance 

 moraine is therefore treated as being equivalent to the earliest part of the West Branch morainic 

 system on the Huron-Erie slope. It seems to be of the order of a substage, whereas the fainter 

 set following immediately after it is of lesser rank. The relation seems to be the same as that 

 obtaining in the Fort Wayne moraine, where the strong front ridge is followed by several weaker 

 ones. 



DISTRIBUTION OF MORAINES. 



DEFIANCE MORAINE IN SOUTHEASTERN MICHIGAN. 



By Frank Leverett. 



COURSE AND DISTRIBUTION. 



In Monograph XLI a description of the Defiance moraine as far north as the Ohio-Michigan 

 line was given and its relations to Lake Maumee were discussed. It lies in the midst of the 

 Maumee basin in northwestern Ohio and marks the position of the ice border during a consider- 

 able part of the life of the first Lake Maumee. The Michigan portion lies outside the limits of 



