Editing Santorini (section)

=== Geological setting ===
The Cyclades are part of a [[Metamorphism|metamorphic]] complex that is known as the [[Cycladic Massif]]. The complex formed during the [[Miocene]] and was folded and metamorphosed during the [[Alpine orogeny]] around 60 million years ago. Thera is built upon a small non-volcanic [[Basement rock|basement]] that represents the former non-volcanic island, which was approximately {{cvt|9|by|6|km|mi}}. The basement rock is primarily composed of metamorphosed [[limestone]] and [[schist]], which date from the Alpine Orogeny. These non-volcanic rocks are exposed at [[Mikros Profititis Ilias]], Mesa Vouno, the Gavrillos ridge, [[Pyrgos Kallistis|Pyrgos]], [[Monolithos, Greece|Monolithos]], and the inner side of the caldera wall between Cape Plaka and Athinios.

The metamorphic grade is a [[blueschist]] [[Metamorphic facies|facies]], which results from tectonic deformation by the [[subduction]] of the [[African Plate]] beneath the [[Eurasian Plate]]. Subduction occurred between the [[Oligocene]] and the [[Miocene]], and the metamorphic grade represents the southernmost extent of the Cycladic blueschist belt.