Kuchera kwakatangazve paWalcott Quarry neGeological Survey yeCanada pasi pekunyengetedzwa kwenyanzvi ye trilobite Harry Blackmore Whittington, uye kuchera kutsva, Raymond, kwakagadzwa anenge 20 metres kumusoro kweFossil Ridge. Whittington, nerubatsiro rwevadzidzi vekutsvagisa Derek Briggs naSimon Conway Morris veYunivhesiti yeCambridge, vakatanga kuongororwazve kweBurgess Shale, uye vakazivisa kuti mhuka dzinomiririrwa dzaive dzakasiyana siyana uye dzisingawanzo kupfuura izvo Walcott akaziva. Chokwadi, mhuka zhinji dzaivapo dzaive nezvimiro zvisinganzwisisike uye kungofanana zvishoma nedzimwe mhuka dzinozivikanwa.
Matombo aWalcott