part 4] SCANDINAVIAN ' MOUNTAIN PROBLEM.' 395 



metamorphic series south-east of the bordering line of the thrust- 

 masses. Compared with Western Finmarken, this quartzite-phyllite 

 (or on the south-east, sandstone-shale) horizon seems to correspond 

 with the lower part of the Raipas Series, just mentioned. 



As to the section in the Alten district (see fig. 4, p. 396) we 

 find here, above the thrust-plane (marked with vertical striatum 

 in the drawings), much-deformed, generally somewhat crystalline 

 stratified rocks that represent felspar-bearing sandstones, and further 

 phyllites, quartzitic bands, and dolomites. It is especially these 

 dolomites that, in my opinion, make it possible to draw conclusions 

 as to the relative age of the thrust-masses and the general tectonic 

 features. 



At the south-eastern border of the thrust-complex is observed, at 

 the base of the deformed sandstones, a small irregular mass of grey 

 dolomite with a peculiar oolitic structure, a rock which undoubtedly 

 must belong to the Porsanger Dolomite horizon. 



A very coarse-grained dolomite is found in connexion with the 

 igneous rocks midway between this locality and the Alten Fjord. 

 This rock, with its brownish weathering (the Porsanger Dolomite 

 weathers greyish-wdiite), may naturally be regarded as a mass of 

 Paipas Dolomite which has been moved south-eastwards. 



On the north-west, at the Alten Fjord, occur in the basal part 

 of the thrust-complex layers of dolomites of highly- varying thick- 

 ness. On the eastern side of the fjord the lower dolomite-layer is 

 situated a little way up from the base of the metamorphic complex, 

 while on the west the dolomite makes up the very base. The dip 

 is towards the north-west. The rocks above are much-deformed 

 felspar-bearing sandstones, the true character of which, however, is 

 increasingly difficult to identify as we pass towards the north- 

 west : the rocks become gradually more metamorphic and 

 crystalline. We soon find rocks of distinct gneissose character, 

 and still farther north-west we meet with true igneous masses, 

 partly of more acid, partly of gabbroid character, rocks that, as- 

 mentioned above, show distinct intrusive characters. The lower, in 

 places non-crystalline, yet much deformed and jointed, dolomitic 

 layer just mentioned, is of peculiar interest, because it is so very 

 like the Porsanger Dolomite that its attribution to that horizon 

 cannot be gainsaid. 



It thus seems, from studies in Western Finmarken also, that at 

 any rate the greater part of the metamorphic sedimentary rocks 

 lying above the non -metamorphic must be regarded as being, 

 generally speaking, of the same age as the unaltered 

 rocks occurring below the thrust-plane and south-east of the meta- 

 morphic zone. They represent the same dolomite-bearing sandstone 

 series in a more or less metamorphosed state. 



In fig. 4 (p. 39G) is given a somewhat simplified section from west 

 to east through the Alien district, in the south-eastern part, passing 

 the southern outlier of Porsanger Sandstone south-south-west of 



