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Age of Earth - 1-1.2 billion years projected from on DNA...

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Age of Earth 4.5 billion years radioisotopic dating of meteorites formed during formation of solar system Earliest Common Ancestor 3.5-4 billion years formation of solid crust vs. observation of oldest fossils Oldest Prokaryotic Fossils 3.5 billion years possible cyanobacteria bacteria (autotrophic - photosynthetic). Western Austrailia (Fig 24.1) Oldest Eukaryotic Fossils 2.1 billion years possible eukarytic algae, Michigan (Han & Runnegar, 1992, Science 257:232) Giardia - "intermediate form" two nuclei, no mitochondria Multicellular Eukaryotes
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Unformatted text preview: 1-1.2 billion years projected from on DNA sequence analysis Cambrian "Explosion" (Animals) 500 million years Burgess Shale Fossils Many of current animal phyla (echinoderms, annelids, arthropods, chordates). appearance of skeletons poss. in response to predation. Summary of animal evolution: Fig. 29.1. Summary of chordate evolution: Fig. 30.6. Origins of Plants from green algae 460 million years Fossil Record Summary of Plant evolution: Fig. 27.3. Oldest Vertebrates 500 million years jawless, fishlike...
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