3 oe CONCLUSIONS CE 53 
4 N-S direction along the eastern shore of the fjord, marks also a. 
zone of upheaval and the basalts (diabases) are confined to trans- 
— versal fissures; the northern straits (Hinlopen and farther north) are 
areas of distinct upheaval. 
4 Reck, in his large monograph on icelandic mass-eruptions,! tries 
4 in vain to prove the „horst“-origin of the steep, vertical-sided tabular 
mountains of minute square area (Herdubreid a. o.), the whole res- 
ting area around them being broken down by faults. The thesis 
appears so improbable, that the author himself does not believe 
it: their origin by upheaval is quite sure. In all, the faulting pro- 
_ cesses related from Iceland must undergo a new control from the 
| standpoint of discernment between movements of upheaval and sub- 
q sidence, for if all subsidences related from Iceland were true ones, 
: there would not remain much of it over the sea level. 
The consequence of the views developed in course of the present 
notice is, that volcanics, as once raised by the theory of v. Buch 
and his followers, may be more active than is admitted even by 
Gilbert in his laccolith-theory, the degree of moving forces lying 
somewhere between both ones. 
Geological Institution of the Academy of Åbo. May 1920. 
1 H. Reck, Isländische Masseneruptionen. Geol. u. palaeontolog. Abhandl. her- 
ausgegeb. von E. Koken. N. F. IX. 1910. H. 2, pag. 30 a. o. 
