86 Revieics — Dr. Reusch's Norwegian Researches. 



and thinly-bedfled, and at other times very massive with foliation, 

 but no trace of bedding. The latter variety is denominated gneiss 

 granite. Subordinate to the gneiss appear mica-schist, hornblende- 

 schist, together with small masses of gabbro and diorite. In this 

 district also occurs a remarkable labrador-rock. The prevailing 

 strike in the peninsula is N.E. and S.W. ; the most important excep- 

 tion to this rule being in the immediate neighbourhood of Bergen, 

 where the strike curves round so as to form a semicircle. The dip 

 varies in different localities. In the neighbourhood of Bergen the 

 beds lie at low angles, but over the larger portion of the peninsula 

 they are either vertical or highly inclined to the N.W. or S.E. 



The neighbourhood of Osoi'en is then referred to in great detail. 

 For purposes of description the district is divided into five zones 

 which succeed each other from S.E. to N.W. in the following order : — 



(1) The low plateau which lies between the elevated country, com- 

 posed mainly of saussurite-gabbro, and the shore of the Fusefjord. 



(2) The zone of saussurite-gabbro. 



(3) The quartzite-conglomerate zone consisting of quartzite-con- 

 glomerate, sandstone, micaceous clay-slate, with fossils, etc. The 

 depression of the Tyssedal marks this zone to the N.E. of Ulven. 



(4) A broad zone of elevated country composed of diorite and 

 hornblende- schist with granite-gneiss. The rocks of the first three 

 zones and those of the southern half of this zone dip at high angles 

 towards the N.W. ; those of the northern half of this zone dip in 

 the opposite direction. 



(5) The zone of the Lysekloster schists. 



The rocks of these five zones constitute according to the author 

 a continuous series. They are, if this view be correct, of Silurian 

 age ; at any rate, the clastic rocks and the contemporaneous volcanic 

 products must be of this age. As the point is one of so much 

 interest, it will be well to quote at some length from the descrij)tions 

 of the principal varieties of rock. The materials of which the first 

 zone referred to above is composed are very variable. On the 

 S.E., that is on the shores of the Fusefjord, there is generally seen 

 a quartz-bearing talc-mica-schist. The three constituents of this 

 rock vary very much in relative abundance ; sometimes the rock is 

 a quartz-schist, at other times a true mica-schist. Bands of gneiss 

 occur here and there. The quartz lamella are sometimes so small 

 that they can scarcely be recognized ; at other times they swell out 

 into large lenticular bodies a metre in length. 



Immediately over the talc-mica-schists occur a series of greenish 

 rocks, in which hornblende plays the dominant, and felspar a 

 secondary part. The names diorite, diorite-schist, hornblende-schist, 

 and green-schist have been applied to varieties of these rocks. 



Different members of this series vary very much in the extent to 

 which foliation has been developed ; some of the rocks having a 

 massive habit. The rocks especially rich in hornblende frequently 

 contain numerous layers of a fine-grained gneiss, poor in mica, 

 which, as a rule, does not show foliation. The author is in doubt as 

 to whether this is not an eruptive rock. 



