7.0 The caldera wall at Cape Alonaki between Fira and Athinios shows an impressive section of Santorini's volcanic history. At sea level, the lowest visible rocks are lavas about 0,5 million years old. In the middle of the photo the Lower pumice series (Bu) is clearly recognizable; it is overlain by the Middle pumice (Bm) and, at the top right, the Minoan pumice series (Bo).
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When did the Catastrophe occur?

The powerful Minoan eruption produced a synchronous ash layer over a great part of the Mediterranean region. Geologists and Archaeologists are very interested in dating this unique marker horizon. If its age were known well enough, one could use it as a guide for the stratigraphy of the entire region.

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