90 Reviews — Dr. ReuscJi's Norwegian Researches. 



The shells of the fossils have disappeared, and only a reddish- 

 coloured earth remains. The fossils whicli have been recognized 

 comprise : Trilobites of the genera Phacops and Calymene ; Gastero- 

 poda, and Brachiopoda not determinable ; Corals, including Cyatho- 

 phyllum, Halysites catenularis, Favosites, etc. ; and Graptolites of the 

 genera Itastrites and Monograptus. 



The author next describes the rocks of Trengereid which occur to 

 the north-east, and on the same line of strike as those of Osoren. 

 They do not show the same succession, but are, on the whole, similar 

 in peti-ological characters. Fossils have been found in the lime- 

 stones, and therefore the author refers them without hesitation to 

 the Silurian period. 



The schists in the immediate neighbourhood of Bergen, which, 

 occur in the N.W. of the peninsula, are of more doubtful character. 

 They contain limestones and conglomerates, and were thought by 

 the author, at first, to belong to the same series as those of Osoren. 

 Fossils, however, have not been found in them, and there are one 

 or two important petrological differences. Thus the quartz-augen- 

 gneiss, so characteristic of the district of Osoren, is absent in the 

 neighbourhood of Bergen ; whereas a normal augen-gneiss with 

 " eyes " of reddish felspar is common in the latter locality. 



Between the Bergen schists and those of Lysekloster there inter- 

 venes an extensive tract of country denominated by the author the 

 XJlriken's gneiss district. This district was examined hastily for the 

 purpose of determining if possible the relation between the rocks 

 of which it is composed and the fossiliferous schists of Osoren. No 

 very important results were obtained as far as the succession is con- 

 cerned, although many extremely valuable facts of local interest are 

 I'ecorded. 



The rocks, which show on the whole bedding and foliation, and 

 which strike, roughly speaking, N.E. and S.W., comprise reddish 

 gneiss with beds of hornblende-schist, foliated labrador-rock, horn- 

 blende-granite or gneiss, gneiss-granite, quartzite and mica-schist. 

 Irregular patches of granite and pegmatite and masses of diorite 

 also occur. 



The author next proceeds to summarize his work. He considers 

 that the facts recorded in the paper, as far as they bear on the 

 structure of the Bergen peninsula, may be interpreted on the 

 assumption that the rocks between Osoren and Bergen form one 

 series in unbroken succession. The entire thickness, according to this 

 view, would be at present about 20,000 metres, and it must, as the 

 author remarks, have been originally much greater, for enormous 

 compression has clearly taken place. 



Another and totally different view is however possible. The 

 XJlriken's gneiss district may behave as the central-massif of the 

 Alps. This would make the fossiliferous beds younger than the 

 more massive gneisses. 



The author evidently inclines to the former view. At any rate he 

 considers that the schists of Osoren form a single series of rocks of 

 Silurian age, having a total thickness, not due in any way to repeti- 

 tion by folding, of about 5,000 metres. 



