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Lacy bryozoans - PowerPoint PPT Presentation

Hadean (4.5 to 3.96 bya)

Hadean (4.5 to 3.96 bya). Earth accreted from bolides. Material differentiated into core, mantle, crust and atmosphere. Hostile conditions. Early crust formation (detrital zircon grains dating to 4.2 bya found in sedimentary rocks), but no rocks still exist in the geologic record.

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Hadean (4.5 to 3.96 bya)