I have probably done this one before but never mind. At http://frontiers-of-anthropology.blogspot.co.uk/2011/07/atlantis-like-su… … it seems that on the floor of the Atlantic, to the NW of Scotland, there is a submerged landscape with furrows cut by rivers and peaks that were once mountains. It goes back 56 million years ago – and was found by oil companies mapping the sea bed and the sedimentary layers within that. It amounts to a very old fossil landscape to the west of Orkney and the Shetlands. It is not to be confused with the continental shelf system that was above sea level during the Pleistocene and early Holocene. This fossil landscape is deeper, a buried sedimentary layer that is sandwiched between a marine landscape, below it and above it. Echo sounding by oil companies involves high pressure air released from metal cylinders producing sound waves that travel to the sea bed – and beneath it, penetrating various geological layers of sedimentary rock. Each time a new layer is encountered, say from a mudstone to a sandstone, an echo is bounced back to the ship by microphones trailing on cables. The information is used to construct a three dimensional image of the rock formations.
Some eight rivers were discovered as well as pollen and coal, undeniable evidence that it was once dry land – for a period following the end of the Cretaceous. In Plate Tectonics theory the survival of a piece of land should not stick around. It should have been subducted. In the Expanding Earth theory this is not a problem – or may not be. Old crust is not subducted. It just becomes stranded in the outgassing process. Funny enough it might not be too much of a problem in a model that involves moving Poles – land that was submerged becoming dry land, temporarily, as the geoid rearranged itself on a number of occasions. In other words, it is probably best to keep an open mind on geology,m without opting for any of the current crop of possibilities. Plate Tectonics may be able to exonerate itself and remove some of the shackles that it has tied itself up in. The expanding earth theory is somewhat attractive – but can it answer all the big questions?
The author of the piece, taking onboard one theory, suggests an upwelling spasm of magma from the Mid Atlantic Ridge formed and swung across the Atlantic in a giant ripple effect (ending up goodness knows where). In other words, the magma ripple caused a temporary uplift – before moving on and submerging the landscape once again (after a couple of million years).
See also N Zhirov, 'Atlantis: Atlantology – Basic Problems' ISBN 978 0898755916