Kvamshestens devonfelt. . 89 



the upper end of the section we find huge masses of red conglo- 

 merate and not before at a height of 820 m. above sea-level the 

 first layers of red sandstones. 



The upper part of the eastern summit of Lillehesten is com- 

 posed of dynamometamorphosed rocks, which partly are very 

 like the syenites below and partly are basic rocks rich in horn- 

 blende (fig. 33 and 34). At one place I have found a greyish 

 granitic rock, an analysis of which may be seen on page 65. 



The contact between the Devonian and the above-lying 

 dynamometamorphosed rocks may be studied in the precipices on 

 the south side of Lillehesten, but in the wet weather when I was 

 there it was too dangerous to climb down to the juncture. If 

 further investigations would show that there is a thrustplane at 

 the contact we have here the same phenomena as on the island 

 Hugo in Sulen, where I have proved an overthrust of the crushed 

 syenite over the Devonian conglomerate. If it will be proved 

 that there is no trustplane at the contact it is most likely to 

 assume that one or more bigger pieces of the old mountains 

 have fallen down into the Devonian basin during violent land- 

 slides as we know them in our valleys and fjords to day. 



The petrological and chemical character of the sandstones. 



(Page 65—70). 



The sandstones contain the following minerals: plagioclase, 

 microperthite, microcline, orthoclase, quartz, hornblende of the 

 same type which we find ind the Caledonian igneous rocks in 

 Western Norway, biotite, muscovite and epidote, further the more 

 accessoric calcite, magnetite, limonite, titanite and zircon. As 

 will be seen from the analyses, the sandstones are rather rich 

 in fresh felspar. The great amount of felspar in the sandstones 

 proves that the sandstones have got much material from rocks 

 rich in felspar. Such a rock is the syenite which contains all 

 the minerals mentioned above. This syenite is also frequent as 

 pebbles in the conglomerates and breccias. But of course also 

 the surrounding quartzites, phyllites, green schists and the archean 

 granites which are frequent in Søndfjord have given some ma- 

 terial to the sandstones. 





