Kuchera kwakazotangwazve paWalcott Quarry neGeological Survey yeCanada pasi pekunyengetedzwa kwenyanzvi ye trilobite Harry Blackmore Whittington, uye chicherwa chitsva, Raymond, chakagadzwa anenge mamita makumi maviri 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 uye dzisina kujairika kupfuura izvo Walcott akaziva.
Derek Briggs naSimon Conway Morris