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The re-establishment of the subduction zone also produced several volcanoes off the Central Coast
Eruptions from these produced layers of ash throughout much of the Sydney Basin.
A lateral blast knocked down a forest of Glossopteris trees at Swansea Heads. They were fossilised by the layers of ash which then covered them.
The ash became a rock called Tuff and the beds here are over 8m high.
1980 Eruption of Mt St Hellens - Wikipaedia
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