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| Keywords: Walcott Cambrian Geology and Paleontology II plate 01.jpg Plate 24 Map of North America showing Distribution of Pre-Cambrian rocks after Van Hise and Leith 1909 Charles D Walcott Abrupt appearance of the Cambrian Fauna on the North American Continent Smithsonian Miscellaneous Collections Volume 57 Number 1 Publication 1940 City of Washington Published by the Smithsonian Institution August 18 1910 1910 Creator Charles Doolittle Walcott PD-old-80 Walcott Cambrian Geology and Paleontology II plates | ||||
