Photos

where Atlantis sank, some layers of its sediments (red clay) are still present.
This layer enters the ocean at this point, testifying the absence of erosion.

see also link in note of
Azores Atlantis tomb - huge island sank.

Obviously the volcanic activity is recent. There are no signs of erosion whatsoever.
But official "Paleogeology" sells this island as the "oldest", "millions of years old", to make it compatible with the hoax of "hot spot theory".

Example from Wikipedia:
The sequence of the island formation has been generally characterized as: Santa Maria (8.12 Ma), São Miguel (4.1 Ma), Terceira (3.52 Ma), Graciosa (2.5 Ma), Flores (2.16 Ma), Faial (0.7 Ma), São Jorge (0.55 Ma), Corvo (0.7 Ma) and the youngest, Pico (0.27 Ma).
http://en.wikipedia.org/wiki/Azores