20 Captain Bayfield on the 
simply red and white ; in others it is variegated red, white} 
yellow, grey and dark reddish brown. It is sometimes argilla- 
ceous, and often ferruginous. There are often interposed bet- 
ween its strata thin layers of a black ferruginous sandstone 
not more than half an inch thick, which easily crumbles, and 
forms a black heavy sand very plentiful on the beaches. It 
also often contaiis thin plates of indurated red and green clay. 
ft only sometimes slightly effervesces with acids : and when 
it is a conglomerate, it coutains much carbonate of lime, both 
in veins, andinit? cement. This is particularly the case on 
the north side of Point Keewawwonan and on the island off its 
north east extremity. 
It is in this sandstone, that the vein of malachite occurs on 
the east point of Copperas Harbour, about seven miles to the 
westward of the east end of Point Keewawonan*, We have 
met with traces of copper ore, in other instances in this sand- 
Stone. 
We were ever on the look out for organic remains in this 
rock but never discovered any : nor has Doctor Bigsby. Lieut. 
Collins however who accompanied us thinks he saw a shell 
and Mr. Schoolcraft in his tour has recorded that he found 
anothers 
In the north western part of the great Neepigon bay, both 
on the main and islands, we remarked that the sandstone 
which was superimposed on granite supported immense beds 
of greenstone, more than a hundred feet thick. In short 
greenstone laid upon the sand stone in almost every island in 
this bay. , 
16, There isa high island near the main, in the east end of 
Neepigon bay, which hasa perpendicular cliff of dark iron 
*Doctor Bigsby has been misinformed. He says, that this vein 
of copper ore is amygdaloid. We have examined the localit 
and have specimens which we took from the place, both of the 
ore and of the rock. 
grey 
