FOUNDATIONS OF THE GREAT DEEP 



37 



FIGURE 17. MAP SHOWING (a) THE AREA INVADED BY THE ATLANTIC SINCE, 

 BY MELTING OF THE FENNOSCANDIAN ICE, ITS FRONT BEGAN TO RETREAT 

 ACROSS THE BALTIC REGION; AND (b) THE ISOBASES ( LINES OF EQUAL UP- 

 LIFT) OF THE HIGHEST SEA BEACHES OF THE REGION. HEIGHTS IN METERS. 



ing outline of the Baltic Sea and, by the stipple pattern, the 

 much greater area which, at some time or other since the ice- 

 cap began to melt, was invaded by the salt water of the 

 Atlantic. The curved lines indicate in meters (3.2 feet to one 

 meter) the heights to which the beaches made by this invading 

 Atlantic have been upheaved. We see the uplift to have been 



