De La Salle Institute

2010-01-19 · Section 21.1 The Rock Record . Geologic Time Scale. Eon. Era. Mesozoic . Period. Epoch . Table . Paleozoic; old life. Mesozoic; end marked by many extinctions. Cenozoic; recent life . Section 21.2 Relative-Age Dating . C. B. D. A. A. B. B. D. C. C. B. A gap in the rock record occurs between a sedimentary rock overlying sedimentary rock. The sedimentary rock was uplifted and exposed to … ................
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