https://en.wikipedia.org/wiki/Permian–Triassic_extinction_event https://en.wikipedia.org/wiki/Permian–Triassic_extinction_ev... I know that I was vague with us

https://en.wikipedia.org/wiki/Permian–Triassic_extinction_event https://en.wikipedia.org/wiki/Permian–Triassic_extinction_ev... I know that I was vague with using the word 'complex', but 96% of all marine species, with only small, 'squishy' (low calcium carbonate content in bodies) species surviving, is enough for me. It's also interesting to look at what probably caused that particular, so far most devastating extinction event.