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Isn't that particularly the case in the Meditterannea where the shore was much, much farther a few millions years ago ? Those canyons were dug by rivers before the shore, if I remember correctly.

Un roi sans divertissement est un homme plein de misères
by linca (antonin POINT lucas AROBASE gmail.com) on Tue Jan 19th, 2010 at 03:23:24 AM EST
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It's indeed thought that many of the dramatic Meditteranean submarine canyons were largely shaped through intensified river erosion, because of the Messinian salinity crisis, some 5-6 million years ago - whereas the erosional forces of rivers are thought not to have been as dramatic for the rest of the world.
by Nomad on Tue Jan 19th, 2010 at 03:50:42 AM EST
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