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Perched at over 1,500 meters above sea level, it is difficult to imagine a time when the mountainside Walcott Quarry in Canada – the first excavation site within the Burgess Shale – was submerged by ocean. And yet, that's why it has become one

Peering back hundreds of millions of years into the past can turn up some astonishing findings – as it has with the discovery of a second species of opabiniid, a soft-bodied arthropod with a segmented exoskeleton that lived on the seafloor during