1914 — 15] Fj eldby giringen mellem Sørfjorden og Samnangerfjorden. 037 



4) Schistose serpentine of a partly developed lenticular struc- 

 ture and with lighter-colonred, often fibrous serpentine as wavy 

 raembranes between the various dark-green, more or less lenticular- 

 shaped parts. 



5) Parallel-schistose serpentine. which also may be designated 

 as serpentine-schist. 



6) Serpentine-soapstones, which consist of varying quantities 

 of tale and serpentine and some magnesite, and which by all links 

 of transition are connccted with type 3. 



7) Schistic soapstone with antigorite, tale and magnesite. 



8) Talc-schist. 



9) Magnesite-marble, forming less important parts in some of 

 the areas. 



The various types are connccted with one another by all 

 petrographic links of transition, and form without doubt a genetic 

 whole, they being separated from one another by the various degree 

 of metamorphism which they have undergone. 



If we wish to form an opinion on which rock has been the 

 original one, we must investigate the massive dark serpentines more 

 closely, for hcre we tind remains of the original minerals. Such 

 serpentines with greater or smaller remains of the primary minerals 

 I have found in the following occurrences : The northernmost of 

 the two dome-formed hills north of Aspekleiven, the occurrence at 

 the curves of the road east of the farms of Hisdal, the occurrence 

 northmost in the valley northeast of Bjørnaas. the occurrence north 

 of Sagaasen, the dome-formed hill east of Haga and the occurrence 

 at Ulleland, situated somewhat east of the map (east of Frølands- 

 vand). 



The various micro-photographs (pl. IV, V and figs. 59, 60, 61, 

 68 and 69) will give an impression of the various stages of meta- 

 morphism found. As may be noticed by reading through the below 

 description of the single occurrences,, the remnants of the unmeta- 

 morphoscd minerals are olivine in a vast majority of cases; besides, 

 there are also some chromite and magnetlte, and, in one single case. 

 some diallagc. As we know that olivine is one of the minerals 

 which are most rcadily metamorphosed into serpentine, it is most 

 probable that the original rocks have been quite pure olivine-rocks, 

 the so-called dunites 



