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Unformatted text preview: limestone N atmosphere First Signs of Life-The oldest sedimentary rocks (3.8 billion) have chemical signatures of life? o Have carbon in it to show it was once apart of an organism-Stromatolites oldest fossils (fossil algae filantes) o 3.5 billion years old -Other late Precambrian life o Left imprints in rocks, trace fossils, not the organism itself The Phanerozoic Eon (545 Ma-2009 AD) Paleozoic Mesozoic and Cenozoic Eras-Breakup of early supercontinent-Cambian Explosion of life-Animals develop teeth? shells Later Paleo-Fish and land plants -Ferns Alfred Wegener-The Continental Drift Hypothesis...
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- Spring '07