3.0 The oldest volcanic tuffs on Santorini record a transition from submarine to subaerial volcanism at Cape Lumaravi. The light tuff of the 1.7 million years old series contains fossiliferous marine rocks that have been lifted above sea level by an intrusion of magma. This doming is less than two million years old. The white island of Aspronisi is visible on the right. A light layer of Minoan pumice covers it.

The Geological Development of Santorini

Sedimentary and volcanic deposits of all colors have been combined to make Santorini's variegated mosaic. A volcanic carapace of lavas, scoria, and ash mantles a core of ancient metamorphosed sediments. In this way, the volcanic island has grown from a succession of very diverse rocks.

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