proterozoic
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proterozoic |
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| navigate by keyword : america archaic calcite carbonate earth elephant existence explained filling formation forms fractures geology giga glacier grains helena hypothesis inorganic life macroscopic marble minerals molar montana mysterious mystery national nature old origin park phanerozoic pre proterozoic pseudofossil puzzling remains rheology ribbons rocks sample science scientific sediments siyeh structures texture tooth usa |
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| Pseudo-fossil elephant molar tooth structure, Glacier National Park.With origin not yet fully explained these proterozoic 1.1 Giga years old rocks formed before macroscopic life could exist on Earth |
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Stockphotos.ro (c) 2024. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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