unit 2: evolution lesson # 3 12.1: the fossil unit 2: evolution lesson # 3 12.1: the fossil record...

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  • Unit 2: Evolution Lesson # 3

    12.1: The Fossil Record

    Answer the journal question in your notebook

  • Group Discussion

    •  Video Link • Answer the questions in your

    lab notebook • What is a paleontologist? • What do they study? • What do we use this information

    for?

  • Objectives

    • Describe the process of permineralization

    • Explain the role of isotopes in dating fossils

  • Perminearlization Fossils

    • Key concepts: Permineralization requires rapid burial in an area with water

    • Over time, bones in the organism are replaced with minerals

    • See page 361

  • Other Types of Fossils

  • Other Types of Fossils

  • What about this guy?

  • What about this guy?

  • Relative Dating

    No, I don’t mean dating your cousin…

  • How is Age Determined?

    Relative dating

    • Estimates when an organism lived by comparing the location of fossils in layers of rock.

    • Older organisms are in lower layers, younger organisms are in top layers.

  • Radiometric Dating

    • Key Concept: Radiometric dating is a process that uses the half life of an isotope to calculate the age of a material.

  • Radiometric Dating

    • Video •  Graphing of the half life of class

  • C om

    m on

    I so

    to pe

    s U

    se d • Carbon – 14: 5,730 years

    • Uranium – 238: 4,468,000,000 years • Potassium – 40: 1,300,000,000 years • Uranium – 234: 80,000 years

  • Radiometric Dating

    •  How old is the Earth? •  Which element should we use to date

    the Earth?

  • Time for a Refresher

    • How old is the Earth? • Was early Earth hot or cold? Would you want to

    live then? Why or why not?

    • How are permineralization fossils formed? • What is a half life?

  • How to Date a Fossil Activity

    • Get into groups of two • Listen carefully to the instructions

  • Due Dates

    • Geologic Timeline Due TODAY • How to Date a Fossil Activity is due next class

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