Ordovician

1000Devonian
720Triassic
718Cretaceous
712Eocene
692Silurian
691Pleistocene
690Miocene
686Carboniferous
684Paleozoic
671Permian
        
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Cambrian Oligocene Pliocene Mesozoic Jurassic sediments Precambrian fossils sedimentary Holocene rocks mya glacial strata volcanic glaciation Paleocene fossil geologic Formation basalt epoch Period Proterozoic ago limestones basaltic genera deposits sandstones basin Cenozoic limestone shallow dinosaur basins lava Tertiary tectonic

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