118 Macfarlane on the Primitive Formations 



ravine called Ormebraekjuvet, which cuts across the conglom- 

 erate, inclined at an angle of 70°. A road and a rivulet here pass 

 through the ravine, and the rocks are seen in profile on both sides. 

 In a coarse mass of quartzose talc-slate, sometimes more or less 

 micaceous or argillaceous, different varieties of quartz are im- 

 bedded ; which have the form of small boulders, or are elongated 

 in the direction of the stratification. Besides these, there may 

 be remarked in the slate, a multitude of red and very fine-grained 

 feldspathic concretions, which betray here and there a gneissoid 

 nature, caused by dark mica-like streaks. These feldspathic con- 

 cretions are the more remarkable, since hitherto, no rock far or 

 near,has been discovered bearing the slightest resemblance to them, 

 although their oval form, in some parts, and the fact that they are 

 sometimes bent in the direction of the undulations of the sur- 

 rounding mass of slate, would favor the view that they are pebbles 

 from an older rock. They become still more remarkable when 

 we observe them repeated at very distant points. Exactly similar 

 gneissoid concretions with those of Tellemarken, of which we 

 here speak, have been remarked in the conglomerate rocks of 

 North Trondhjems Amt. The boulder-like fragments in the rock 

 of Ormebraekjuvet, attain the size of a closed fist, and lie usually 

 so near to each other, that they constitute the greater part of the 

 whole rock. Eastward from Holvig, towards Vase, down in Vest- 

 ^orddalen, conglomerate talcose rocks also are found. Here, in 

 a talcose slate, a layer was observed including larger and smaller 

 kernels of quartz, sometimes almond-shaped, at other times more 

 irregular ; and one part, apparently segregations from the slate it- 

 self. The foliated portions of the rock are bent and rolled around 

 these masses. On the weathered surfaces of the rock, these ir- 

 regular, and, as it were, imbedded portions, have a lighter color 

 than the surrounding mass. There is probably some feldspar 

 present in these, as well as in the gneissoid concretions already 

 mentioned, and their lighter colour may be due to kaolin from its 

 decomposition. Southward from Holvig, a layer of similar rock 

 occurs, which belongs to the clay slate." 



" Conglomerates which belong to the chloritic rocks in this 

 district, are found at various places in the upper part of Vest- 

 ijorddalen, in the neighborhood of the cataract Rjukanfbss. 

 From Vaa3, over and beyond Maristigen, a hard chloritic slate 

 predominates ; which appears often as if it had been torn in pieces, 

 and then joined together again, and which contains other very 



