Riaan Posted July 24, 2010 Author #51 Share Posted July 24, 2010 it is a known fact that during the hight of the last ice age, the whole Celtic Shelf (the area on which Ireland, the UK and the Channel are located) was above water. The ice reached up to northern Ireland and half way down England or even further, the area south of the ice sheets was a barren tundra, as has been shown by finds. So yes, the rivers will have formed valleys that are now below sealevel. But all that happened like 15000 or more years ago... Hi Abramelin, This is indeed true, but in that case the sea level would have been lower by 100m or so, not more. The river in question descends to about 4000m below current sea level, which would imply that much more than only the Celtic shelf would have been exposed. Could this have had something to do with a massive impact of an asteroid or something? An impact that could have changed the shape of the earth, i.e. from perfectly spherical to slightly ellipsoidal? The equatorial radius of the earth is about 21 km more than the polar radius. This is pure speculation, of course. Trying to make sense of the river / submarine canyons. Link to comment Share on other sites More sharing options...
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