linguistic:paraphrasing, quality:correction
Sequence

Intense magmatic activity of the first major phase (BO /Minoan A) of the eruption deposited up to 7 m (23 ft) of pumice and ash, with a minor lithic component, southeast and east. Archaeological evidence indicated burial of man-made structures with limited damage. The second (BO /Minoan B) and third (BO /Minoan C) eruption phases involved pyroclastic surges and lava fountaining, as well as the possible generation of tsunamis. Man-made structures not buried during Minoan A were completely destroyed. The third phase was also characterized by the initiation of caldera collapse. The fourth, and last, major phase (BO /Minoan D) was marked by varied activity: lithic-rich base surge deposits, lava flows, lahar floods, and co- ignimbrite ash-fall deposits. This phase was characterized by the completion of caldera collapse, which produced megatsunamis.