u 



A X (' I E X T M I X I X' G 



2d Group. 



Portage Lake Region. 



Quincy and PewaMc Mines. — Portage fake resembles in form the long, narrow, 

 and crooked Scottish lochs. Like them its quiet surface reflects the outlines of 

 most exquisite scenery. 



It connects with Lake Superior through the channel of Sturgeon River, which 

 has so little descent below the point of junction, that all material changes in the 

 level of the great lake are felt throughout this inland water. 



The Quincy landing is situated on the north side of Portage Lake, about twenty 

 miles from Keweenaw Bay. The northern shore, which is nearly east and west at 

 the landing, does not show rocks at the water level. 



A succession of drift, knolls, points, and headlands, rising about 200 feet above 

 the surface, overlook this shore. Above this elevation, and attaining a height of 

 500 to 600 feet, are seen projecting ledges and bluffs of trap rock, inclosing mineral 

 veins. This rock is also visible at the heads of ravines where rivulets fall over low 

 precipices forming small cataracts. 



The first signs id' ancient excavations occur near the lake level, and what is 

 remarkable, are not in the rock, but in the sand and boulder "drift." 



Fig. S. 



Ancient Pits in the Bouldeb 1>rikt or Gravel, Quincy Location. 



The mosl capacious of these gravel pits, however, occur on a line nearly level 



and aboul ion fret above the surface of the water. 



