1 92 I. Xo. II. THE STRANDFLAT AND IsOSTASY. I 49 



and the group of islands called Mudvær to the soutli of the latter. At 

 Alflesa north of Engelsbo Skerries there is granite and limestone. 



Although the inner parts of the submerged plateaus of this granite 

 legion, c. g. south of Fugl vær, may be almost as level as the plateaus of 

 mica-schist and limestone to the north, their outer parts, towards west 

 and southwest, are less regular, as the map Fig. 1 13 shows, and their outer 

 edge, c. g. at Sjola, Steinan, and Engelsbo Skerries, is less sharply defined 

 than in the regions of mica-schist and tuff, at Skjærvær, and of limestone, 

 at Flovaer and Ytre Flesan to tlie north. 



The outer parts of the submerged plateaus of the granite regions 

 have thus a resemblance to the Træna Plateau built up of granite. 



On the whole as regards their surface relief there seems to be a 

 typical difference between the submerged plateaus built up of granite, 

 or similarly resistant rocks, and those built up of limestone, mica-schist 

 or other less resistant rocks. 



But irrespective of the differences in geological structure it is natural 

 that the surface of more or less isolated submerged plateaus far out to 

 sea and exposed to the full effect of the breakers, should be somewhat 

 lower and more outward sloping, with a less sharply marked edge We 

 may also find this in the region of the mica-schist and limestone, c. g. on 

 Skjærværgrunnan outside Skjærvær (see Fig. 113) where the smallest 

 depth is 17 metres and there is no sharply defined edge. At the outer- 

 most edge the plateau southwest of Skjærvær (and west of Hysvær at 

 Flesa, Langtaran, Einarfall, &c., see Fig. 115) also exhibits similar fea- 

 tures. We do not know, however, whether the rock may not be granite 

 in this region, although the island Flesa consists of highly metamorph- 

 osed tuff. We find granite quite near to the south at Sjola which 

 is obviously situated on the same ridge as Skjærværgrunnan (see 

 Fig. 113). 



The plateaus at Onsteinen, Ertenbraken, and Storbraken (northeast 

 of Ryggefallan, see Fig. 113) are built up chiefly of mica-schist and to 

 some extent of limestone (e. g. Storbraken). They have the very level 

 and horizontal surfaces near sea-level, with sharply defined edges and 

 very steep side slopes, which are typical of plateaus cut in these rocks. 



At H or svar to the south the rock is to some extent gneiss, and the 

 islands are more scattered, and the surface is less regular (see Fig. 113). 

 West of Horsvær and south of Ryggefallan the submerged surface is very 

 irregular and resembling that of a granite region, and some rocks rising 

 above the sea actually consist of granite. 



The banks at Hogbraken (southwestern corner of map Fig. 1131 may 

 possibly also consist of granite, although they have perhaps more the 

 features of plateaus of mica-schist, with fairly level surfaces, well-marked 

 edges bounded by steep side slopes. 



