A layered sequency of volcanic lapilli (tuff)) is exposed at low tide at the southern end of the beach in front of Taroona High School. [Lapilli are droplets of molten/ semi-molten lava ejected from a volcanic, cooling as they travel through the air ( Wikipedia). These lapilli tuffs formed by the violent eruption about 60-40 million years ago (early Tertiary), of a nearby volcano (possibly) located somewhere within the Derwent River. More detail about the geology can be read in the end of Chapter 1 by Simon Stephens in The Taroona Book:
p.12 - p.20 Geology by Simon Stephens.pdf
The High School area is part of a large zone of ongoing landslip instability. You can read the Kingborough Council’s Report of it here:
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