Suggestion for TPOD

[scott]

I invite you to check out the Tweed Valley, far North NSW.

its apparently the remains of a massive volcano, an ancient volcanic caldera, but i'm wondering how the inside walls could have collapsed in such a regular fashion all around? that and the elevations at the bottom of the valley floor don't seem to correspond to generally observed drainage dynamics.. shrug..

The 'plug', that is wollumbin or mt warning could perhaps be the upraised portion found after a massive electrical discharge event, like in those photos from the planets?

I am only a geog grad (BA), but I reckon this merits a look.