204 Cincinnati Society of Natural History. 
very coarse, although an individual bowlder may occur here and there 
amongst it, and it is chiefly derived from the rocks of the Laurentian 
series. The height of the first chute above the sea, is 265 feet; the 
second chute, 348 feet; the fourth chute, including its fall of 39 feet, 
432 feet; Round lake, 520 feet, or nearly 60 feet below Lake Huron. 
Sand is extensively distributed over the plains of the Bonnechere, 
and over a large portion of the area between it and the valley of the 
Madawaska. Most of the valley of the Little Madawaska is covered 
with sand on either side, and the country between its head waters and 
Lake Kamaniskiak is one continuous sandy plain. The height of land 
in passing over the portage to the Madawaska is 968 feet abuve the 
sea, and Lake Kamaniskiak is 906 feet above the level of the sea. No 
organic remains have been detected in any of these drift deposits. — 
He, afterward,* surveyed the valley of the Meganatawan river and 
part of the coast or Lake Nipissing. Stratified clay was found on the 
banks of the Meganatwan, above the second long rapids, east of Doe 
lake. The color is a brownish drab; it is very tenacious, and does 
not effervesce with acids. The highest exposure is a little over 1,000 
feet above the level of the sea. A fine, strongly tenacious clay occurs 
on the Nahmanitigong near the main elbow, where the upward course 
of the river turns to the south at an elevation of 710 feet above the sea. 
The color of the clay is chiefly pale drab or buff, but bands of reddish 
clay are interstratified and some of pale blue overlie the whole. The 
clays of the interior are usually overlaid by a deposit of coarse yellow 
sand. Among the bowlders on Lake Nipissing, many were observed to 
be of a slate conglomerate like that of the Huronian series, and they 
were frequently of very great size. . 
In the succeeding year+ he explored portions of the Huron and wes- 
tern districts of the Province of Canada, and found that the course of — 
the currents which had borne along the drift was from northwest to— 
southeast. This is indicated by the pebbles and bowlders of metamor- 
phic rocks which were clearly derived from the Laurentian and Huron- 
ian formations on the north shore of Lake Huron, and by the character 
of the fossiliferous rocks and pebbles which have been moved a shorter 
distance, and by the grooves and scratches which invariably have a 
bearing from the northwest to the southeast. 
He, afterward,{ made a survey north of Lake Huron, where he found 
SK ee ee 
* Geo. Sur. of Canada., Rep. of Prog., 1854. 
+ Rep. of Prog. for 1855. 
t Rep. of Prog. for 1856. 
