Index Fossils, Evolution, Biostratigraphy and the Geologic Time Scale - PowerPoint PPT Presentation

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Index Fossils, Evolution, Biostratigraphy and the Geologic Time Scale

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First appearances of new species. First appearances of new higher taxa. Extinctions of species ... Archean 'ancient' circa 4.6 Ga to 2.5 Ga ... – PowerPoint PPT presentation

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