174 



in fossils, though their pétrographie variation is unusually strong. 

 Nathorst, to whose description^) I refer, mentions, among 

 other varieties, white, yellow, grey and black limestones and 

 dolomites, red, green, and dark schists, and red, green, grey, 

 and yellow sandstones. 



Within the area of these rocks I myself only landed at 

 one spot, viz., in Polhems Dale, (Segelsällskapets Fjord), quite 



Fig. 2. Åkerblom 1., near the entrance of Segelsällskapets Fj., shewing 

 folded manycoloured Silurian rocks. (C.Kruuse phot. 28:8:1900). 



near the limits of the primary rock. The fact that we 

 were so close to the base of the formation gives the ob- 

 servations taken a certain value. Although I had no op- 

 portunity, except at a distance, of observing the line of 

 junction itself, yet it was evident that, as Nathorst has 



1) Op. cit. pp. 288 — 298. 



