POSTGLACIAL DEVELOPMENT OF CONNECTING EIVEKS OF GREAT LAKES. 



485 



DETROIT RIVER. 



DETROIT RIVER AT DETROIT. 

 DISTRIBUTARIES. 



The next ridge which obstructed the flow of the new river was the low interlobate moraine 

 which crosses the river at Detroit and upon which the higher parts of that city and of Windsor, 

 Ontario, are built. This ridge is so broad and flat that it is scarcely perceptible to the eye 

 as such, except where seen in cross section along the bank of Detroit River. The bank is 

 noticeably higher along the city front, standing 30 to 35 feet above the river, than it is either 



3 4 5 Allies 



Distributary delta 



Detroit interlobate Temporary distributaries 



Fine sand, often more 

 or less windblown 

 {Fine mud west of Oakwood 

 U'hiKjs I" 'I'll" "J Hirer Rtnujc; 



Figure 13.— Map showing distributaries of Detroit River at Detroit and delta in Lake Rouge. 



east or west of the city, where it f alls away to a reedy marsh at the level of the river. From 

 the river bank half a mile east of Woodward Avenue the axis of the ill-defined ridge runs about 

 northwest. In Canada it runs about southeast from Windsor nearly to the shore of Lake Erie, 

 before turning northeast. This moraine has already been fully described (p. 284). 



There appear to have been two distributaries on the Canadian side, one called the Grand 

 Marais, about a mile back, and another farther out. Both are very shallow and not well 

 developed. Those in Detroit are small and close to the river, the farthest being less than a 

 mile from it. (See fig. 13.) Probably a well-marked depression or sag already existent in the 

 crest of the moraine was followed by the river, for otherwise distributary channels would cover 

 a wider interval on the moraine crest, as they do at both St. Clair and Trenton. 



