9.21.06 - Evolution of the Earliest Vertebrates Oldest...

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9/21/06 Evolution of the Earliest Vertebrates - Oldest rocks o Acasta gneiss o Canada o (North American Craton) o metamorphic rock o 4.5 Ga (billion years ago) - 1 st self replicating molecules o experimental evidence o C, H, N, O primitive atmosphere o Proteins being formed Base pairs - First life o Western Australia o 3.5 Ga o apex chert sedimentary rock o Primitive atmosphere High CO2 Life fixes C Blue-green algae (aerobic autotroph) Aerobes increase O2 in atmosphere CO2 begins to decrease because of this - First Protists o 2.1 Ga o reef builders o sponges, corals o build a framework in the marine environment - First Plants o 1.7 Ga o began in the marine system - First animals o Soft bodied o 0.6 Ga o heterotrophs (eat other things) o trace fossils o “Edicara” geologic age - Cambrian age begins o 540 Ma (million years ago) o shell exoskeleton o “Cambrian Explosion”
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9/21/06 1 st evidence of exoskeletons defense from predators/prey o Trilobites
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This note was uploaded on 04/03/2008 for the course GEOLOGY 206 taught by Professor Quinn during the Fall '06 term at Rutgers.

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9.21.06 - Evolution of the Earliest Vertebrates Oldest...

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