1255 
at present their masses overlie each other in the overthrust sheets 
of the mountain chains. These movements are explained by the fact 
that the old continental flocks of Eurasia and Indo-Africa have 
moved towards each other, in which process continental areas have 
executed horizontal movements. Similar movements may have co- 
operated to originate the Atlantic Ocean. Whether horizontal or 
vertical movements have prevailed may to some degree be made 
out by comparing the geological composition and structure of the 
opposed coastal regions. The points of similarity enumerated by 
Wererner and contested by Sokraer *) have still retained their signi- 
ficance in some measure and the concordance of the eruptive rocks 
discussed by us does not clash with the prevalence of horizontal 
movements. 
!) W. Soeraer. Die atlantische „Spalte”. Zeitschr. der Deutschen Geol, Gesellsch. 
1916, Monatsber. Bd. 68, S. 200 folg. 
