The missing lava at 70 meters elevation built a dyke, that became a more than 100 m long stairway to the ocean, cutting through pillow lavas near sea level.
Reply to corjan3:
see also link in note of
Azores Atlantis tomb - huge island sank, which shows another dyke a few hundred meters to the east.
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).
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