
The Tweed Volcano was active about 20 million years ago.
Volcanic eruptions lasted about three million years.
The shaped volcano basin has been hollowed out by the erosion effects of the landform induced, very high local rainfall.
The central once molten hard rock core of the volcano is Mount Warning, aka Wollumbin.
The volcano basin’s encompassing walls are exposed in the north, they are a high, vertical, hard-rock, …
This kind of geological formation is called an ‘extinct volcano erosional caldera’.
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Australia was once at the south pole, there was no ice, it was so warm that there were crocodiles.
The mountainous entire eastern side of the continent was rainforest, inland Australia was a shallow warm sea. [Sea levels were higher because there was no ice.]



