MILE-STONE

\mˈa͡ɪlstˈə͡ʊn], \mˈa‍ɪlstˈə‍ʊn], \m_ˈaɪ_l_s_t_ˈəʊ_n]\
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1871 - The Cabinet Dictionary of the English Language

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Archaeozoic Era

  • the time prior to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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