stratigraphy geochronological scale the triassic history earth |
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navigate by keyword : earth development prehistoric acid ancient astronomy birth cambrian chalky clouds coal devonian disappeared explosion extinction fossils geographical geography glaciation history jurassic land neogene origin paleogene permian planet quaternary rain scale science silurian solar space stratigraphy surface system trias triassic universe vector |
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Stratigraphy. Geochronological scale. The Triassic in the history of the Earth. Acid rain. Clouds |
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