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Mt Warning from the Tweed Regional Gallery

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A view towards the hub of the bowl-shaped valley that has been my home for a long time now. That mountain in the distance is the remnant of the core of a large shield volcano.
The Tweed Valley, the caldera, is more than 1000 m deep and 40 km wide. This is larger than the Ngorongoro Crater in Tanzania. It is the biggest erosion caldera in the southern hemisphere, and among the largest calderas in the world.

It is one of the few places in the world where erosion processes have revealed the sedimentary deposits and metamorphic rocks underlying the caldera. The volcano erupted when the earth passed over the East Australian Hotspot about 23 million years ago. The volcano erupted  through the 250-200 million year old Brisbane Metamorphic Series, spreading out over the Clarence-Moreton Basin sedimentary floor that was deposited 135-200 million years ago.

By the time the eruptions ceased, the volcano had risen to a height of more than 2 km, ash and lava being deposited around it till the diameter of the volcano and its slopes was about 100 km. The volcano had spread out from Byron Bay in the southeast, Lismore in the southwest, to Mt Tamborine in Queensland to the north. Most of the volcanic material has been eroded away over the past 20 million years. (thanks to LINK)

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BoudiccaAmat's avatar
what a majestic   'neighbour'  ...........I'm glad he's not a noisy one these days :)