A List of Minerals and Organic Remains. 81 
soft; but often very hard, and imperfectly crystalline. At 
fia Cloche and elsewhere in Lake uron, and in Lake 
George it most probably rests on transition quartz and 
transition greenstone. I have seen it within a few yards 
) 
them in actual contact. In Lake Superior, near Gros Cap 
. it abuts on gneiss, and greenstone. 
he 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-siate 
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 
communications. o these are to be added fibrous arra-~ 
£0 it . o tee ; 
Spar, quartz crystals, and bitumen. Coal bas been found 
onthe Flint River, a branch of the Ri 
Huron, in some quantities, and in a dis 
believe, above the contiguous lake. 
and white ashes. : ‘ 2 f= 
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 iay- 
ers, straight or contorted, in masses, and forming fossil casts. 
Von. VIL__No. r, 1 
