Zl 
C. Lapworth— Recent Discoveries in Sweden. 29 
' denuded, prior to the overlying Silurians having been accumulated. 
Their debris and fragments, in many instances, are largely found 
in the Silurian rocks, especially in the conglomerates between A 
and B. These metamorphosed rocks must belong to either the 
Cambro-Silurian or Cambrian age. 
The rocks between A and B are similar to the rocks elsewhere 
called ‘Old Red Sandstone ;” they, however, must be of Silurian 
age, as they occur in a continuous sequence, which underlies a lime- 
stone containing fossils, principally of Llandovery types. 
The rocks between B and D in the vicinity of the place where 
Sir Richard Griffith, years ago, found Silurian fossils, have been thus 
classified ; but in another locality, where the fossiliferous limestone 
was unknown, they have been called “ Old Red Sandstone.” 
The sequence from the rocks between B and D is continuous up 
into the red and purple rocks in the sequence above the line D. It 
is, therefore, evident that the rocks above the horizon of D must be 
either the equivalents of a portion of the “ Dingle Grits,” or on a 
lower horizon. If this is correct, they must belong to the Silurian 
period. 
If the country is traversed from Pomeroy, co. Tyrone, to Ennis- 
killen, co. Fermanagh,—and from Drumshambo in Leitrim past 
Boyle (co. Roscommon) to Ballaghadereen, co. Mayo, and from 
thence by Croaghmoyle to Louisburgh and the Killarney districts, it 
will be found that the rocks of all these districts have similar 
aspects, as mentioned in my former paper; although only in some of 
them have fossils of Silurian types been found. To those already 
recorded, ] would now add another; that is, Silurian fossils have 
been met with in the so-called “ Old Red Sandstone” of the Curlew 
Mountain district. It should be mentioned that Sir Richard Griffith 
suggested this years ago. 
V.—On Linnarsson’s Recent Discoveries IN SwepisH Gronoey. 
By Cuas. Larwortn, F.G.S., ete. 
ay the present communication I propose to direct the attention of 
British Geologists to three most valuable memoirs recently pub- 
lished by Mr. G. Linnarsson, the eminent paleontologist of the 
Geological Survey of Sweden; and at the same time to point out, as 
briefly as may be, what appears to me to be their special bearing 
upon certain tentative or disputed points in British Geology. They 
treat of subjects of great interest to the student of the palzonto- 
geology of the Lower Palozoic or Proterozoic Rocks; but are 
printed in the Swedish language, with which, unfortunately, few 
amongst us are familiar. The first two papers deal with the Grap- 
tolite-bearing rocks of Sweden; the third treats of the peculiar 
fauna of a recently-detected horizon in the prolific Paradoxidian or 
Primordial Zone. 
Whatever concerns the Graptolite-bearing rocks of Sweden is 
at present certain to be received with respectful attention by the 
geologists of this country, from the fact that the Proterozoic strata of 
