J. A. Birds — On the Isle of Man. 



83 



First Continental Period. 



Maximum Height of Land. 



First- Submergence. 



The Lower Boulder-clay would be form- 

 ing, at first beyond the 100 fathoms line 

 (see Map in " Account of the Isle of Man," 

 p. 279), and afterwards among the British 

 Isles till the land sank down to about the 

 same elevation as at present, represented 

 by- 



Whilst the land was sinking to 



B 



Emergence. 



G 



The same. 



Upper Boulder- 

 clay formed by 

 coast-ice and oc- 

 casional foreign 

 icebergs. 



Second Continental Period. 



Maximum Height of Land. 

 Second Submergence. 



Upper Boulder-clay, continuing to 

 Middle Drift Sand and Gravel would be te formed % coast-ice and occasional 

 formed chiefly by icefloes and icebergs icebergs, 

 drifted from foreign coasts. 



A 



C 



A temperate climate and no glacial 

 formation. 



A 



Present Elevation. 



