NORTHWEST SHORE OF LAKE SUPERIOR. 



369 



in the river-bed, where it is found to rest on an uplift of greenstone (No. 214). I 

 did not explore the river beyond this point. Colonel Whittlesey, however, con- 

 tinued the exploration several miles further up. He informed me, on his return, 

 that beyond the greenstone, he met with slaty hornblende, which he estimated at 

 one thousand feet in thickness. He followed the stream, which is a succession of 

 rapids, to a point which he supposed to be fourteen miles, in a direct line, from the 

 lake-shore. The highest ridge measured by me on this river, was seven hundred 

 and twenty-two feet above the level of the Lake. The strike of the ridges which 

 cross the river is north by east and south by west. 



A short distance below the mouth of Manidowish River, the brecciated conglo- 

 merate is thirty feet thick, and contains some immensely large fragments. It is 

 overlaid by a bed of No. 629, which rock is found at various points in the next two 

 miles, overlying a very ferruginous rock, which sometimes has the characteristics of 

 an ochre. It presents the appearance of a minutely-divided sedimentary deposit, 

 and is distinctly bedded. It is amygdaloidal in some places, compact in others, and 

 contains small fragments of trap. In contact with the trap beds and dikes, it is 

 highly indurated. 



12. KagiUMwaninawah River. — A section of the rocks on this river, for the first 

 three miles,* shows as follows, in descending order : — 



11. A bed of reddish-coloured trap, embedding large fragments of metamorphosed sandstone, from two 

 to ten feet in diameter. It also contains fragments of conglomerate aud of the underlying shaly beds. 

 Its general character is basaltic. 



10. Thin beds of hard grit, containing scales of mica and rounded grains of sand. 



9. Conglomerate; containing fragments of a still older conglomerate. It has a shaly, ferruginous 

 cement; and the pebbles, together with the large fragments, are all rounded. 

 8. Metamorphosed sandstone. 

 7. Metamorphosed slates. 

 6. Metamorphosed sandstone. 

 5. Amygdaloidal shaly-beds. 

 4. Ferruginous grits. 

 3. Shaly-beds; amygdaloidal. 

 2. Volcanic grit-beds, containing a few amygdules. 

 1. Volcanic grit ; amygdaloidal. 



The beach at the mouth of this river is sandy, and lined with boulders, banked 

 up to the height of ten feet above the lake-level. On the southeast side of the 

 river, the hill next the Lake is composed of drift, red marl, and clay, and rises to 

 the height of one hundred and sixty feet. This is underlaid by the trap bed, and 

 metamorphosed sandstone, which rises to the summit of the next ridge, which is 

 four hundred and eighty-four feet above the Lake. The bed of the river, on the 

 northern side of this ridge, is one hundred and eighteen feet below the summit, and 

 is composed of metamorphosed sandstone, which gradually assumes an amygdaloidal 



* See Section on Kagitshiwaninawak River. Plate 1 N, Sec. 8, 



47 



