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Chapter 15

Chapter 15. Evolution Evidence & Theory. 15-1 The Fossil Record. Nature of Fossils. Fossil Trace of long dead organism Where Found Sedimentary rock How Created Dust, sand, mud deposited by wind/water over dead organisms Develop From Shell, bone, teeth, stem. Types of Fossils. Mold

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Chapter 15

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  1. Chapter 15 Evolution Evidence & Theory

  2. 15-1 The Fossil Record

  3. Nature of Fossils • Fossil • Trace of long dead organism • Where Found • Sedimentary rock • How Created • Dust, sand, mud deposited by wind/water over dead organisms • Develop From • Shell, bone, teeth, stem

  4. Types of Fossils • Mold • Imprint on rock such as limestone • Shape of organism • Cast • Mold filled with hard minerals • Amber • Fossilized tree sap

  5. Robert Hooke • In 1668 • Concluded fossils are remains of once living plants and animals • What else did he do? Remember way back when… • Hmmm?

  6. Distribution of Fossils • Age • Relative • Steno 1670 Law of Superposition • Determined by fossils position in strata/rock • Oldest fossils = deepest youngest = surface • Absolute • Radioactive dating • Radioactive isotopes • Carbon-14; Carbon-12 • Ratio of decay of carbon-14 to stable carbon-12

  7. Succession of Forms • Extinct • Species no longer exists • Mass Extinction • Period in which large number of species disappear • Biogeography • Study of geographical distribution of fossils & living organisms • Ex of biogeography

  8. Geological History of Earth • Table 15-1 • Era  Period  Epoch • Interactive geologic time

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