Geology. 277 
m J 
range into Assynt, in south-west Sutherland, and to Gairloch, and Kis- 
orn, in Ross-shire, at Balnakiel, in Durness, that Mr. Charles Peach 
o 
talline rocks as the representatives of the Devonian or Old Red Sand- 
Stone formation, the author begs to show why such an opinion seems 
to be untenable, and to point out that, both from their physical position 
and the nature of the imbedded remains, they are most probab 
Lower Silurian age. For, whether the section be made across the va- 
Tous strata between Loch Durness and Loch Eribol, or from the latter 
of the lowest members of this great crystalline series of stratified rocks 
- Very diversified characters. It was suggested that the fossils in 
> rabies being of a whorled or circular form might prove to be - 
ymenia of the Devonian rocks; but this suggestion is now set as 
= Mr. Salter, who, after a close examination | f the fossils or witha 
oderi be: 
and, on the whole, he is disposed to refer them to the genus Raphis 
urian limestones 
ma, a shell which. has been found in the Lower Silurian of 
is in accordance with the geological succession of the region, anc 
tenances the id es, ~% 
Ayrshire, (Girvan). So far, therefore, as the fossil bene 
idea expressed some years ago by Prof. Nico 
es, it 
“i 
the 
