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Geological History & Rock Layers

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  • What is the oldest known type of fossil?
    Stromatolites
  • What does the Law of Superposition help scientists determine?
    The relative age of rocks and fossils
  • What do sediments form over time?
    Horizontal layers
  • What type of rock forms from compacted sediment?
    Sedimentary rock
  • Where in Australia are stromatolites found?
    About 100 km north of Perth
  • According to the Law of Superposition where are the youngest rocks?
    At the top
  • About how old are stromatolites?
    2 billion years
  • Which dating method uses radioactive isotopes?
    Radiometric dating
  • What does relative dating tell us?
    Which fossil or rock is older or younger
  • According to the Law of Superposition where are the oldest rocks?
    At the bottom
  • Why are stromatolites important?
    They show early life and oxygen production on Earth
  • What method gives the exact age of a fossil?
    Absolute dating
  • Which isotope is used for dating very old rocks?
    Uranium-238
  • What does absolute dating tell us?
    The numerical age of a rock or fossil
  • What created stromatolites?
    Cyanobacteria
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