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Arthurs Seat volcanic complex

A 314 m hill on the Mornington Peninsula, the Boonwurrung Wonga, built from the roots of a Devonian volcano: ignimbrites, rhyolites and the Dromana Granite. New zircon dating puts its eruptions at about 390 million years ago, in the Middle Devonian.

Dated events and their evidence

• about 389,700,000 years ago mainstream
  a rhyolite ignimbrite of the Arthurs Seat complex gives a zircon U-Pb age of 389.7 million years (plus or minus 4.3): Middle Devonian, older than the Late Devonian long assumed source
• 1802 CE mainstream
  in February John Murray of the Lady Nelson names the hill after Arthur's Seat in Edinburgh; on 27 April Matthew Flinders climbs it as a station for observations source

Where

38.3520° S, 144.9530° E

Sources

• https://en.wikipedia.org/wiki/Arthurs_Seat,_Victoria
• https://doi.org/10.1080/08120099.2025.2538585
• https://doi.org/10.1080/08120099.2026.2686687
• https://ozgeology.com/blogs/news/the-hidden-volcano-in-the-mornington-peninsula

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