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| navigate by keyword : along ancient arthropods astronomy birth cambrian chalky coal devonian disappeared explosion extinction fossils geographical geography glaciation history invertebrates jurassic land marine neogene ocean ordovician origin paleogene permian planet prehistoric quaternary radiation scale science silurian solar space sponges stratigraphy surface system the triassic universe vector geology |
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| Earth development. Ordovic aeon in the history of the Earth. Warm climate. Distribution of marine invertebrates. |
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