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Date: 2012-03-16 13:50:19Charles Doolittle Walcott Paleozoic Phanerozoic Burgess Shale Walcott Trilobite James Hall Cambrian Walcott-Rust quarry Lagerstätten Burgess Shale fossils Paleontology | Add to Reading ListSource URL: www.geosociety.orgDownload Document from Source WebsiteFile Size: 250,65 KBShare Document on Facebook |