4 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 3, 



the presence of three members of the sedimentary deposit, viz. sand- 

 stone, lerskiffer (black schist) and limestone, but does not state 

 whether they were accumulated in that ascending order. Indeed, 

 without the knowledge that has since been obtained concerning the 

 true order of these formations in Britain, Russia and other countries, 

 and its application to less disturbed districts of Scandinavia, no one 

 could venture to form even a well-founded conjecture of the Dale- 

 carlian succession. Thus, although the chief members of the lower 

 sedimentary strata are clearly referable by their fossils to portions of 

 the Lower Silurian group, they are here more insulated than in any 

 part of Europe I have examined ; no example having yet been de- 

 tected of more than two contiguous sub-groups M'hose relations are 

 determinable. After this preliminary notice, I will now briefly de- 

 scribe a few natural sections which indicate these dislocations. 



The low country adjacent to the eastern shore of the Lake Siljan 

 is covered with debris (in parts a perfect Os) ; but a little above 

 the hamlet and post-house of Uitby, and -thence ranging along to 

 the farms of Alsarby (see Plate L fig. 1), courses of limestone and 

 shale (c) are exposed on the lane sides and in the farm-yards, the 

 beds being nearly vertical as you ascend the hill, but less highly 

 inclined at a lower level. These strata consist in parts of thin- 

 bedded, earthy limestone with shelly way-boards, in some parts of 

 red and in others of grey colour, in which the large Orthoceratites 

 duplex ( O. communis, His.) and the O. trochlearis occur, together 

 with the gigantic Asaphus tyrannus (nob.), (A. Heros, Dalm), A. 

 expansus, Orthis calligramma and other forms. These fossils leave 

 not the slightest doubt that the strata in question are identical with 

 those of the chief limestone at Kinnekulle, which there, as in nu- 

 merous other tracts, form the central or pri::cipal mass of the Lower 

 Silurian group of Sweden. But the relation of this limestone to in- 

 ferior or superior deposits is invisible; the slope towards the lake 

 being entirely covered up with detritus, whilst between the calcareous 

 ledge of the higher hill of granite {q) there is also a rough talus 

 of angular fragments of that rock. 



Seeing, however, the vertical and dislocated position of the beds, 

 which here range Trom N.N.E. to S.S.W., in conformity with the ge- 

 neral outline of the shoulders of granitic rock on the east, and fur- 

 ther observing that this latter (^) is a red unstratified younger granite 

 or granitello, the masses of which in situ are visible at a few paces 

 from the limestone, little doubt was entertained, on our very first 

 inspection, that the granite (q) had been protruded posterior to the 

 limestone (c) — a conclusion to which we were led by all the other 

 sections we made. 



In the lower country, extending from Uitby to Rattvik and in the 

 valley to the north, the shale inferior to the limestone is visible, 

 whilst at Rattvik the limestone again crops out. Following the out- 

 line of the lake and passing another promontory of granite which 

 cuts oflT the limestone and here advances nearly to the water, the 

 ground beyond it on the west subsides into the low fertile holm of 



