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Dercourt&Paquet 1985



Unt merekonstruksi sejarah bumi diperlukan skala waktu yg mana diperoleh dengan cara menggunakan metoda fisika yg diterapkan kepada batuan beku & metamorf. Penentuan umur dg cara ini disebut penentuan umur absolute, sedangkan penentuan umur dg menggunakan data fosil yg terdpt dilapisan sedimen disebut penentuan umur relative (Dercourt & Paquet 1985:207)
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