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Y 
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On the Geology of the Northwestern Regions of America. 315 
Arctic Silurian Fossils. 1 
On the Geological and Glacial Phenomena of the Coasts of Davis’s Straits and 
: : s. ; vol. ii, 
BayrtEetp, on the Geology of the N. Coast of the St. Lawrence. 1837. Trans, 
S v. 
Fe the Geology of Lake Huron. By Dr. Biassy. 1824, Trans. Geol. Soc. 2nd 
ries, vol. i, 
On the Geology of the Lake of the Woods [and Rainy River]. By Dr. Bressy, 
1852. Quart. Journ. Geol. Soc. Vol. viii. 
On the Geology of Rainy Lake, South Hudson’s Bay. By Dr. Bicspy. 1854, 
Quart. Journ. Geol. Soe. vol. x. 
On the Drift of the Lake of the Woods and South Hudson’s Bay. By Dr. Bressy, 
1851. Quart. Journ. Geol. Soe. vol. vii. A ; 
Narrative of the Arctic Land Expedition to the Mouth of the Great Fish River. 
By Captain Back, R.N. Appendix on Geology. By W. H. Firroy, M.D. London, 
36. ; 
Journal of a Boat Voyage through Rupert’s Land and the Arctic Sea, in search 
of the Discovery Ships under Sir. John Franklin. By Sir. Joy Ricuarpsox. Lon- 
. 1851. 
On some points of the Physical Geography of North America. By Sir. J. Rrcx- 
ARDSON. 1851; Quart. re . vol. vii So 
Report of a Geological Survey of Wisconsin, Iowa, and Minnesota, and incidental 
of a portion of Nebraska Territory [including the Red River of Lake Winnipeg]. 
By Daviw Date Owen. Philadelphia, 1852. 
The chief sources of information, however, on which I have 
relied in confirmation of my own observations are the valuable 
Memoirs of Mr. Salter on Arctic Silurian Fossils, published in 
the Quarterly Journal of the Geological Society, vol. ix, and in 
the Appendix to Dr. Sutherland’s Journal of Capt. Penny’s Voy- 
Franklin, are very extensive, and throw much valuable light on 
the mineral structure of the various formations which prevail in 
the northern regions of America. It was not, however, until 
Within the last few years that any considerable collection ha 
made of the organic remains belonging to these formations, 
by which alone their relative ages and their true characters can 
be determined. Some of the fossil remains alluded to have been 
described and figured by Mr. Salter in the papers already referred 
to, others by Dr. Dale Owen, of the U. S. Geological Survey, Dr. 
kKland and others; and some (as will be subsequently noticed) 
have been described, though only incidentally and in general 
terms, by Sir John Richardson, Mr. Sowerby, the late Mr. Kanig 
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