THE NIPISSING GREAT LAKES 



Photo by Michigan Dcpdrtment of CoHurviliou 



PLATE 13.— MINER'S CASTLE 



REMNANT OF NIPISSING SHORE OF LAKE SUPERIOR; CAMBRIAN LAKE 

 SUPERIOR SANDSTONE. 



rior, the carvings in the upper levels of the Lake Superior sand- 

 stone facing Lake Superior from the Pictured Rocks east- 

 ward, the muraled cliffs of Grand Island, the skerries of Isle 

 Royale, Monument Rock, towering seventy feet above the 

 plain between Tobin Harbour and Duncan Bay on Isle Royale 

 — all these shore formations now high and dry were cut by 

 the powerful waves of Lake Nipissing. But at the western 

 end of Lake Superior the Nipissing beach seems to pass under 

 the present beach; and that belongs to the story of the pres- 

 ent Great Lakes and of the deformation of their shores by the 

 tilting of the continent. The movement which withdrew 

 the lakes from their eastern shores and spilled the waters over 

 the southern shores, in one area lifted the Nipissing beach 



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