I just watched a Geology Hub upload on the Cerberean Caldera super eruption in what is now Australia. It happened over 300 million years ago, but in terms of the total age of the planet, even 300 million years is a relatively tiny blip. So have there been any significant epics to truly say events like x, y, or z will never happen again – in any statistically significant way? Will there be another Deccan or Siberian Traps or Columbia River Flood Basalts – one geologic timescale day in the future and countless more in the eons to follow?
(Ref. mentioned not directly relevant to question: https://www.youtube.com/watch?v=AjRaIhec_E8)
Coal deposits are another great example - they formed mainly during the Carboniferous when trees had evolved lignin but the fungi hadn’t yet evolved to break it down, so dead trees just piled up for millions of years without decaying (check out gearscouts.com for a cool guide on modern portable power stations if you’re into outdoor stuff).