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Ch. XLL] 



REFERENCE TO THE ORIGIX OE SPECIES. 



407 



constancy of the position of continents and oceanic basins 

 tlirouo-liout long geological periods. The Azores, in which 



Made 



Mioce 



snr- 



Canaries, are of Upper 



rounded ^ by a zone of ocean more than 10,000 feet deep. 



more 



than 15,000 feet between the Azores and Portugal, showing 



Fig. 138. 



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10 



NfeRljiOf'CR^ 



20 



-J 



Map, showing the cleptli of the ocean "between the eastern volcanic archipehigos 



of the North Atlantic and the Mainland. 



The ocean is tinted according to its deptb., thus : 



From the coastline to a depth of 1,000 feet lightly l^ 

 From 1,000 feet to 10,000 feet . 



davTcer W^^^n^ 



Below 10,000 feet , . . very darkly H 



The line of 1,000 feet is lettered A. B., and the line of 10,000 feet C, D, 



that a land communication would imply, first, the sinking of 

 a great continental area down to the sea4evel^ and then a 

 further depression of the same from the sea-level to a depth 



^ See Map. 



