Not completely correct. The Mount Gambier eruption (VEI 4) was about 5,000 years ago and it's only 100km away, so it's possible they had contact with people fl

Not completely correct. The Mount Gambier eruption (VEI 4) was about 5,000 years ago and it's only 100km away, so it's possible they had contact with people fleeing that area, along with ash fall and a 10km high plume. VEI 5 and you have a Mount St Helens scale event. A similar eruption (and one of the more likely to occur in Australia) would be catastrophic with the town literally built around the crater.