Geologic time scale
In depth chapter 19 Geologic Time Scale Examining layers of sedimentary rock scientists have put together a chronology of Earths history It is divided into 4 Eras 1 Precambrian 35 bya
era myascale geologicmyaerageologicscaletimeperiodextinctionmesozoicearthpaleozoiclifeprecambrianappeareddecemberhistoryflourishedcontinentsyears
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