Revieivs — Dr. Reusch's Norwegian Researches. 87 



The rocks just described are succeeded by a very remarkable con- 

 glomerate, which deserves most attentive consideration. It contains 

 pebbles of bornblende-bearing rocks, such as diorite and hornblende- 

 schist, gneiss, granite poor in mica, an epidote-bearing rock and 

 sometimes pebbles of quartzite and limestone. The rock has 

 been subjected to great pressure, which has flattened the pebbles. 

 Secondary minerals, principally mica and chloi-ite, have been 

 developed. Sometimes the pressure has been so great as to roll out 

 the pebbles into flat discs and thin lamellae, and in these cases, if 

 mica has been richly developed, the rock resembles a mica-schist. 

 Its true nature, however, may be easily discovered by tracing it 

 along the strike, when it will be seen to pass into an unmistakeable 

 conglomerate. In the neighbourhood of Mobergvold the junction 

 of the conglomerate with the overlying rock, a quartz-augen-gneiss, 

 is very sharp, and fragments of the latter rock occur in it. The 

 lower part of the conglomerate has been here so metamorphosed by 

 pressure, and by the development of secondary minerals, that at 

 first sight one is disposed to regard it as a hornblende-schist. Even 

 in true hornblende-schists, at least in rocks which the author under 

 other circumstances would have no hesitation in classing under this 

 head, there occur lamellse which may be regarded as rolled-out 

 pebbles. The quartz-augen-gneiss which succeeds the conglomerate 

 is a very well characterized rock. The "eyes" consist of white 

 granular quartz. The matrix is essentially composed of a clear 

 greenish-yellow fine-grained or compact felspar. Large individuals 

 with cleavage planes and twin striation may occasionally be re- 

 cognized. The felspar contains chlorite scales, and sometimes plates 

 of black and white mica. The chlorite and mica-scales bend round 

 the " eyes " of quartz. The rock as a whole shows parallel structure, 

 but not bedding. 



The quartz-augen-gneiss is succeeded by another band of con- 

 glomerate, and over this second bed of conglomerate is the first zone 

 of micaceous clay-slate with fossils. The last-mentioned rock is 

 sometimes a dull slate (Schiefer), at others a black or grey glistening 

 slate. The glistening varieties become more and more micaceous, 

 and pass into a perfect muscovite-schist. The author has not 

 definitely determined the species of mica; had he done so, he would 

 probablj' have found it hydrous and of the nature of sericite. This 

 slate (? schist) is always finely plicated and wrinkled, and some- 

 times several sj'stems of folds may be seen crossing each other. 

 Near Indre Moberg there occurs in this series a grey glistening 

 schist which effervesces with acid. Macroscopically this rock is a 

 micaceous clay-slate (Thonglimmerschiefer). Microscopically it is a 

 fine-grained calcite-bearing gneiss. Layers of crystalline limestone 

 occur associated with the micaceous clay-slate and in these cup corals, 

 chain corals, and other traces of organisms have been found. 



The fossiliferous beds are succeeded by chloritic sparagmit.' This 

 consists of fragments of fine-grained greenish rocks, which are diffi- 



1 The term Sparagmit appears to be applied by Scandinavian geologists also to a 

 quartz -felspar grit. Sucb a rock for instance as our Torridon sandstone. 



