64 STKATIGRAPHICAL GEOLOGY 



serpentines, eclogites, and crystalline limestones, evidently a series 

 of metamorphosed stratified rocks. Finally on the borders of the 

 Palaeozoic basin these schists graduate upward into dark -grey clay- 

 slates (Thonschiefer) with some more siliceous layers of lydite or 

 hornstone. These are the Przibram shales which formed the base 

 of Barrande's " Stage A," but as they are overlain unconformably 

 by Cambrian conglomerates they are now separated from the rest 

 of that stage and classed as Archaean. 



As in the case of the Alpine Series much doubt has recently 

 been thrown on the old interpretation of the stratigraphy of this 

 area. Some of the gneisses, as well as the granites, are now regarded 

 as intrusive rocks, and no break or definite unconformity has been 

 detected in the series, so that the whole of it may belong to the 

 later portion of Archaean time ; at any rate nothing demonstrably 



C. Gx PA. 1C. K.91. a. a. Ql. Or. G&1. <fo. 



PlG. 9. SECTION THROUGH PART OF THE BOHMER WALD (Glimbel). 



C. Cambrian. K. Cryst. limestone. Gl. Mica-schist. Gyl. Gneissie granite. 



Ph. Phyllite. Q. Quartzitic schist-. Gr. Granite dyke. Gn. Gneiss. 



Protarchaean and comparable to our Hebridean has yet been 

 recognised. 



4. Scandinavia 



The most extensive exposures of the Archaean platform in 

 Europe are to be found in Norway, Sweden, and Finland. The 

 whole surface area of Finland, except where covered by drift and 

 alluvium, consists of a complex of Archaean rocks Avith many 

 intrusive masses of granite and porphyry. The greater part also of 

 the Scandinavian peninsula is occupied by a similar complex, which, 

 however, passes beneath a broad, central, and axial band of 

 Cambrian, Ordovician, and Silurian deposits. 



The natural eastern border of this band of Palaeozoic sediments 

 is obscured by very large tracts or sheets of overthrust and meta- 

 morphosed rocks which, according to Scandinavian geologists, 

 include representatives both of the later Archaean and of the 

 Palaeozoic Systems. There is consequently a close correspondence 



