24 Cuptain Bayfield on the 
~~. 
rock appears, in a long and low chain of small iSlets, across 
a bay : and the south west end of the island is of conglomerate 
belonging to the same formation, and exactly similar to the 
shores of Point Keewawonan opposite, where copper is also 
found, Copper has also been found among the Wisconsan 
mountains. Either these mountains or those of Point Keewa- 
wonan, there is little doubt, are the original site ofthe great 
mass of native copper described by Henry, and since by School- 
craft on the banks of tne Ontonagon river. 
19. The central parts of Michipicoten island have never 
been explored ; but there are appearances sufficient to justify 
us in affirming, that granite and greenstone are its principal 
rocks, 
On its south side, like ail the rest of the islands of the north 
coast, amygdaloid, porphyry, and trap greenstone abound ; 
but no sandstone, except in debris, was noticed. 
20. Caribou Island, so little known hitherto, is about 6 
miles in circumference and of horizontal sandstone, surmount- 
ed by sand and boulders of the rocks of the north coast. These 
last are in immense quantities off its south and south west 
points, and forma very dangerous shoal for about 3 miles 
out into the lake. 
21. The islands of the Twelve Apostles, as well as the 
others, have never been examined, excepting by ourselves. 
They are twenty-three in number, and are all based on the 
sandstone, which is here highly ferruginous. Over the sand- 
stone isathick deposit of ferruginous sandy clay, of a dark 
red colour. Itis remarkable that the north-east and south- 
east sides of all these islands have perpendicular cliffs of sand- 
stone, seldom more than 60 feet high. ‘These were fast de- 
creasing from the action of the waves 5 whilst on the south-west 
and north-west sides, the cliffs were of the red sandy clay, 
There were no beaches, excepting at the south points of these 
islands, where, in general, there were triangular points of 
sand, 
