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Date: 2010-12-07 20:14:45 Charles Doolittle Walcott Paleozoic Phanerozoic Burgess Shale Walcott Trilobite James Hall Cambrian Walcott-Rust quarry Lagerstätten Burgess Shale fossils Paleontology		Add to Reading List Source URL: gsahist.org Download Document from Source Website File Size: 256,07 KB Share Document on Facebook

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