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- 12:48, 13 April 2023 Sky talk contribs created page A Phanerozoic time scale (Q26272) (wbeditentity-create:2|en: A Phanerozoic time scale, Gradstein, F.M., and Ogg, James, 1996, A Phanerozoic time scale in Episodes, v. 19, nos. 1&2, p. 3-5.)