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History
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Charles Doolittle Walcott (left) at a fossil quarry excavating the Burgess Shale in British Columbia, Canada.
Charles Doolittle Walcott (left) at a fossil quarry excavating the Burgess Shale in British Columbia, Canada.
Maotianshan Shale, site of the discovery of the Chengjiang Biota, (UNESCO world heritage site)
Maotianshan Shale, site of the discovery of the Chengjiang Biota, (UNESCO world heritage site)
Pikaia fossil from the Royal Ontario Museum's collection.
Pikaia fossil from the Royal Ontario Museum's collection.
Metaspriggina fossil from the Royal Ontario Museum's collection.
Metaspriggina fossil from the Royal Ontario Museum's collection.
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Pikaia
Pikaia
Fossil of Pikaia gracilens (Syntype USNM PAL 57628)
Fossil of Pikaia gracilens (Syntype USNM PAL 57628)
Plate 20 of Walcott Cambrian Geology and Paleontology II (1911), by Charles Doolittle Walcott, showing fossils of Pikaia and Oesia
Plate 20 of Walcott Cambrian Geology and Paleontology II (1911), by Charles Doolittle Walcott, showing fossils of Pikaia and Oesia