54 



HANS BEUSCH. 



[No. 7. 



rocks; at the same time they have been altered, often nearly 

 past recognition; they are now schistose and have in large part 

 got their original minerals replaced by new ones. 



Besides such massive eruptives there are others, chiefly a 

 number of greenish, crystalline, more or less schistose rocks 

 (generally occurring together with the dioritic rocks), which 

 must be considered as tuffs. In short one must suppose that 

 during the silurian age in the Trondhjem district chiefly shore- 

 formations and volcanic mountains were built up; the latter 

 were often considerable both as regards height and area. 



Thus we find the same relations which are now known 

 from the Diocese of Bergen and which have already some time 

 back been described as being found on the British islands. 



IL Section along the line of the Meråker railway. 



(Sketch map p. 6 and 7. Literature p. 5 and note p. 8.) 



The railway which goes from Trondhjem eastwards towards 

 the border of Sweden cuts through the strata, giving a cross 

 section of them. The hypothetic diagram page 9 shows the 

 authors views on the subject, according to which the strata have 

 on the whole a fanshaped position, like that whichThas often 

 been described as found in the central parts of the Alps. In the 

 middle of the section at Gudaa there are steeply dipping beds 

 of mica-schist 1 and gneissose strata. There is a subordinate 

 occurrence of interstratified dioritic, often finely grained and 

 schistose rocks. These must be considered as the northern ex- 

 tension of a large dioritic mass of which great mountains further 

 south consist. The outlines of the latter are indicated on the 

 map page 28. At one place there is an inclusion in the mica- 

 schist of a bed of pressed quartzite-conglomerate. It may be 



1 Several varieties were found by Dr. Archibald Geikie (whom I had the 

 pleasure of accompanying in this district) resembling the Scottish Moine- 

 schists. 



