Reviews — Dr. ReuscJi's Noncegian Researches. 89 



stituents, and also to variation in their relative proportions. One of 

 the most beautifully bedded rocks described and figured hy the 

 author occurs near Skeie. The rock is a true olivine gabbro, and 

 the bedding is due to the repetition of layers alternately rich and 

 poor in olivine. 



(3) Zone of quartzitic sandstone and quartzite-conglomerate with 

 micaceous clay-slate. 



The micaceous clay-slate is similar to that already described. The 

 sandstone shows no special fragmental structure. It is often schistose, 

 and then mica occurs on the divisional planes. This series is covered 

 at Hagerik by hornblende rocks and granulit. At the junction there 

 occurs a remarkable conglomerate 1 metre thick. The matrix is 

 a greenish scaly chlorite, in which flattened pebbles of a compact 

 rock with splintery fracture and a dirty yellowish-brown fine-grained 

 rock — an epidote-diorite — occur. Greenish-black needles of horn- 

 blende, grains of magnetite and sometimes garnets occur in the 

 matrix, and also in the pebbles. Hornblende crystals may frequently 

 be seen lying partly in the matrix and partly in the pebbles. 



(4) Zone of diorite and hornblende-schists with granulit and 

 granite -gneiss. These rocks rest upon those of the last zone. They 

 are similar in character to the diorite and hornblende-schists which 

 occur in zone (1). 



(5) The zone of the Lysekloster schists. These are more or less 

 allied to those of zone (4). They are distinguished as a whole by 

 beds of gneiss with white mica. 



The author next proceeds to describe the mode of occurrence of 

 the fossils and the character of the rock in which they are imbedded. 

 Fossils have been found at two horizons. At the southern horizon 

 near Kuren, cup corals, Ealysites, and Syringoplnjllum are found in 

 beds and lenticular patches of a greyish-blue crystalline limestone 

 which occurs in a dark shining micaceous cla^'-slate. 



At the northern horizon a much richer fauna has been found. The 

 best localities are situated near the road leading from Ulven to the 

 north-east, the richest fossil source being near the Vagtdal farm- 

 house. The rock is a light-grey glistening schist (? slate), which, 

 to the unaided eye, is seen to consist lai'gely of small scales of 

 Muscovite (?). Porphyritic roundish plates of a brown mica, whose 

 cleavage planes are independent of the schistosity, also occur. Under 

 the microscope quartz showing aggregate polarization, and not 

 having a fragmental aspect, is seen to form an essential consiitueiit 

 of the rock. Brownish rutile, often in twins and beautifully crystal- 

 lized tourmalines, may also be detected. There occur, moreover, 

 dark flecks and spots of doubtful character. The rock is easily 

 broken between the fingers. The following is a bulk analysis by 

 Professor Kjerulf. 



SiO, 



... 54-05 CaO 



. ... 1-69 



NaoO 



... 2-94 



AU)3 



... 21-24 MgO 



. ... 4-49 



Ti()2 



•89 



FeO 



... 7-70 KoO 



. ... 5-26 



H2O 



... 1-74 



In a special analysis 1-45 per cent, of TiO^ was found. 



