Kvamshestens devonfelt. 93 



of Caithness" 1 ) we find the following remark on the climatic con- 

 ditions in Scotland during the sedimentation of that group: „A 

 period of aridity followed the Calledonian Old Red Sandstone, 

 during which the breccias and fine-grained sediments of the Barren 

 Group accumulated". 



The sandstone series in the Kvamshesten area, especially the 

 series of the green sandstones, I suggest correspond to the Flag- 

 stone Group. In the just mentioned paper we read about the time 

 of that group: „Following this (the period of the Barren Group) 

 there was probably a slow change to somewhat wetter conditions 

 and the lacustrine deposits of Lake Orcadie gradually invaded 

 the region." 



In the Devonian area of Kvamshesten we find no strata of 

 marine origin. 



Later alterations. 



(Page 82-83). 



In some localities the strata form synclines (Lillehesten fig. 30) 

 and a folding also has taken place at Krokevand (fig. 21). East 

 of Bjørndalsvand there have been folding and some dislocations 

 (fig. 22, 23, 26). 



The best-developed dislocation occurs at Tjønnebotn (T on 

 the map). There is here a displacement as well in a vertical as in 

 a horizontal direction. The horizontal displacement is about 300 m. 



The thrustplanes at the lower boundary (fig. 4, 5, and 32) 

 show that a dislocation in almost horizontal direction has taken 

 place. It is most likely that the Devonian formation has been 

 moved a short distance as a whole. 



If future investigations will prove that there exist a thrust- 

 plane between the crystalline rocks in the eastern summit of 

 Lillehesten and the underlying sandstones there must in post- 

 orcadian time have been an overthrust of almost the same kind 

 as I have described from the island of Hugo in Sulen 2 ). 



x ) „The Geology of Caithness" by C. B. Crampton and R. G. Car- 

 ruthers; with contributions by John Horne, B. N. Peach, John S. Flett 

 and E. M. Anderson. Edinburgh 1914. 



2 ) Carl Fred. Kolderup: Overskjøvet fjeld over dev.nisk konglomerat 

 i Sulen. (Festskrift til professor Amund Helland paa hans 70 aars fødselsdag 

 11. oktober 1916. Kristiania 1916). 



