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Burgess Shale-type fossils from the Greater Phyllopod Bed of the Burgess Shale (Walcott Quarry Member), photograph taken in cross-polarized light. The fine details of soft-bodied anatomy are preserved as thin carbonaceous films. Soft-bodied fossils figured include examples of the priapulid worm Ottoia prolifica (O), the problematic medusiform animal Eldoniia ludwigi (E), and the arthropod Marrella splendens (M). Image courtesy of Jean-Bernard Caron (Royal Ontario Museum).
