* 
NV. W. portion of Lake Huron. 267 
On the North side of the Lesser ees ua toward the 
east end, the rock at the level of the inke is of two 
kinds, the. one, white, hard, and so slaty as_ resemble a 
shale, and without fossil’ remain: s, the other, cs 0] ntifully 
d wi oft, full of kn 
and very much less slaty. The interrupted low cliffs which 
range along the acclivity of the Island from thirty to seven- 
ty feet above the water, furnish a dull brown granular, rath- 
er inant slaty limestone, which gives out a disagreeable odor 
n percussion and is free from shells, as far as I could ob- 
serve. 
This island does not seem to agree in its geological for- 
mation with Drummond Island. Its rocks are e very much 
concealed by vegetation and debris. It is proper to register 
every observation respecting these iceinthies: as. aes their 
remoteness, total want of attractions and moreover from the 
difficulty of subsistence, visits to them will be very rare and 
rief. 
The west end of the Grand Manitou, at the level of the 
lake has a flooring similar to that of Collier’s Harbor, and 
at the height of ten—thirty feet, a slaty rock like that of the 
cliffs of the Lesser Manitou; but inodorous. This is in the 
in general i is strewn with the oe lin 
mond, and abounds in the same kind of organic Saeacl 
* * These are Arwuieped accurate ee of spheres, ser 9 pe 
See eae 
and ahalf 
another series of cay- 
ities, They are so times to run into each other. 
