A List of Minerals and Organic Remains. 81 
soft; but often very hard, and imperfectly crystalline, At 
La Cloche and elsewhere in Lake Huron, and in Lake 
George it most probably rests on transition quartz and 
transition greenstone. I have seen it within a few yards 
of both, but was unable from accidental causes to detect 
them in actual contact. In Lake Superior, near Gros Cap 
it abuts on gneiss, and greenstone. 
The gray wacke above noticed, underlies the limestone 
from Montmorenci to Cape Tourment, a distance of twen- 
ty miles, in horizontal layers, varying from fine granular 
slaty, (used for grindstones.) to a coarse conglomerate of 
quartz pebbles It is surrounded by the older rocks, ex- 
cept on the south west. 
A conglomerate wholly calcareous occurs in situ near 
the foot of the Long Sault of the River Ottawa, and at the 
Coteau du lac, three miles below Lake St. Francis. com- 
posed of angular and rolled masses, sometimes very large, 
of fine granular limestone, light brown and blue, imbedded 
ina dark brown paste. A similar rock occurs with the 
limestone about Poughkeepsie in the state of New-York, 
and at Aubiginy opposite Quebec interleaved with clay-slate 
and gray wacke, highly inclined, and having a south-west di- 
rection. 
» Having now sketched the mineral and geological charac- 
ters of this limestone, I proceed to notice its contents. Its 
minerals, although not belonging exclusively to mountain 
limestone, still abound therein to a remarkable degree. 
Yellow blende exists in three localities, remote from each 
other. Galena and iron pyrites are universal, although not 
in large quantities. Fibrous and foliated sulphate of stron- 
tian are scattered profusely over all the lakes and water 
communications. ‘To these are to be added fibrous arra- 
gonite, fluor, numerous and often sp!endid varieties of calc. 
spar, quartz crystals, and bitumen. Coal has been found 
on,the Flint River, a branch of the River Saguina, Lake 
Huron, in some quantities, and in a district little elevated, I 
believe, above the contiguous lake. It gives a good light, 
and white ashes. 
Chertz, which is always a prominent substance in moun- 
tain limestone, is in large quantities in that of Lakes Erie, 
(north-east end,) Huron, Superior, and of the Woods, in lay- 
ers, straight or contorted, in masses, and forming fossil casts. 
Vou. VIL—No. 1. 11 
