Example: stock market
The Geological Time-scale
Old Tertiary-Quaternary boundary Miocene 24 Oligocene 35 Eocene 55 Cainozoic Palaeogene (previously Tertiary) Palaeocene 65 Cretaceous 145 Jurassic 210 Mesozoic Triassic 250 Permian 300 ... (Minerals have replaced the carbon-based structure within the mould, or
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