THE STORY OF THE EARTH. 



tion, can have given rise to the diverse types of 

 . which the oldest fossiliferous rocks make 



AH. 



Archean rocks arc widely spread on the 



of Scandinavia, Finland and North-West 



Russia, S . and Bohemia, and in Bavaria as 



Iritish Islands. Rocks of this I 

 will probably be found all over the globe, wher- 

 opportuftity of examining the ma- 

 il upon which the most ancient fossiliferous 



In the Western Highlands in Scotland, from 



Cape Wrath southward, the schists and funda- 

 mental gl eiss of that region arc displaced by an 

 incredible multitude of horizontal thrusts which 

 break them up into parallel sheets, almost as . 

 marked as planes of stratification, with which they 

 were at one time confused. Among these crys- 

 talline rocks are included great thicknesses of 



>nes, and folded in among them occasion- 

 ally are fossiliferous hands of limestone. 



Other archsean areas are exposed further 

 thward. The most interesting are the ci 



talline rocks about St. David's, in lVmbi. 



shire; at tin- Longmynd, in Shropshire; in the 



central axis in ( 'arnar vonshire ; and in Anglesey. 



In • ancient British rocks, evidei 



ntemporaneous activity of 



tnOS, 50 that anion- the ol< 



l; tish alternating with schist the 



of Bangi >r, ( larnarvon, Llyn 

 dan . >me of these localities with 



i e Wrekin and Ercal I Iill make 

 i ambrian age \s Inch 



nth indurated volcanic ash. In the 



ghbourh St David's the rhyolitic lavas 



