Geology and Mineralogy. 189 
II. GroLtogy AND MINERALOGY. 
1. On the Geological hice of the Polar Expedition sae 
Admiral Sir George Nares, F.R.S. ; by Captain H. W. Frt 
.. aud C E Rance, Esq., F.G.S.—The ne 
describe the Laurentian gneiss that occupies so large a tract in 
Canada as extending into the Polar area, and alike underlying 
a 
e 
Upper Silurian age, are the Cape-Rawson beds, forming the coast 
line between Scoresby Bay and Cape Cresswell, in lat. 82°40’; 
ees —_ are unfossiliferous slates and grit dipping at very 
igh an 
From the fact that Sir John Richardson found these ancient 
rocks in the Hudson’s Bay territory to be directly overlain by 
limestones, containing corals of the Upper Silurian Niagara an 
Sater. group, Sir Roderick 2 ach seh pie that — Polar 
the 1 
Siluriane are there lso. nsive areas of dolomite 
of a creamy color omen by MClintock around the magnetic 
pole, on the western side of Boothia, in King William’s Island, 
and in Prince of Wales Land, ab ounding in fossils, described by 
Dr. Haughton, probably ee _ whole of the Silurian era 
and possibly a porsion of the 
he bases of the Silurians ic poi in North onsets and 
grains, and still higher in the series ~ cream-colored limestones 
he Silurians occupy Prince Albert Land, the central 
und wes rn portion of North Devon, Hh the whole of Cornwallis 
Island, “The Carboniferous Limestone was discovered, rising toa — 
* = 8 
fossils in common with the rocks of the same age in | 
and the Parry Archipelago, being probably tee connected 
