On the Geology of the Northwestern Regions of America. 321 
Dr. Conybeare, in his Report on Geology, to the British Asso- 
ciation for 1832, had noticed the great similarity between the 
fossils brought to England by the Arctic Expeditions of Parry 
and Franklin, and those of the Silurian formations of our own 
country. The Geological Notices appended to the Narratives of 
those Expeditions by Professor Jameson, Mr. Konig, and Sir 
John Richardson, who had the advantage of Mr. Sowerby’s assist- 
ance in examining the organic remains, had previously led to the 
same view ; and it may now be considered as finally established 
by Mr. Salter’s examination and description of the extensive 
collections from the Arctic Regions,* brought to England by 
the recent expeditions in search of Sir John Franklin. The forma- 
tion described by Dr. Sutherland as extending along the shores 
of Wellington Channel and Barrow’s Straits, and considered by 
Mr. Salter to belong to the Upper Silurian group, has siuce been 
identified, through its organic remains, at several points along the 
coasts of Hudson’s Bay. Recognized by Mr. Logan at Lake 
emiscamang, and at Lakes Abbitibie and St. John, on the 
Northern edge of the Laurentine Mountains, it has been success- 
ively identified along the Moose and Albany Rivers flowing into 
ames’s Bay, at Marten’s Falls,t and along the northern edge of 
the granitic plateau, thence to York Factory, along the Great 
Fish River of Sir George Back, at Igloolik,§ and along both 
Shores of Prince Regent’s Inlet, || to which Jast-mentioned locality 
Mr. Salter’s investigations bring us down. The extreme points 
here indicated are “Lake Temiscamang, in 47° 19’ N, and the 
Shores of Wellington Channel, between 77° and 78° N, giving 
the enormous range of 30 degrees of latitude, over which, as 
4r as our present information reaches, the Silurian formation ex- 
tends uninterruptedly without any important variation, so far as 
18 known, either in its mineralogical constitution or its stratifica- 
tion. The fossils from this district hitherto submitted to Mr. 
Salter’s examination belong exclusively to the Upper Silurian. 
They are comprised in the following list ; and most of them are 
figured in the Appendix to Dr. Sutherland’s Journal of Captain 
Penny’s Expedition. 
* Quart, : 
au By Se a Hichardsod sad 10 Basalt Boal Voyage through Rupert's 
me . eet 
Dr. Fitto Professor Jameson. 
SP ahering ieee meas 428. I cannot. om, ee eaich of the 
Heoursys e2 large @ portion of the North American Continent, to Pie A 
cently published work te apse Murchison on ‘Siluria. To this important 
Work, and to the long seri rese: i e fruit, the geologists of 
America must feel under the highest obligation, not only for the clear and compre- 
View it exhibits of the whole phenomen 
Stoonp Series, Vol. XXI, No. 68,—May, 1856. 4] 
