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Deep Dive into Fossils: Unearthing Earth's History

Explore the fascinating world of fossils, from their formation in sedimentary rocks to the clues they provide about past life forms. Learn about different types of fossils, dating methods, mass extinctions, and the study of biogeography. Delve into the distribution of fossils and the succession of life forms through the ages.

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Deep Dive into Fossils: Unearthing Earth's History

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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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