Geology Final Exam: Geologic Time

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Canvas47
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Geology Final Exam: Geologic Time
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2013-12-15 02:41:30
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Geology Final Exam Geologic Time
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Geology Final Exam for Geologic Time
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  1. What is the difference between absolute and relative dating?
    RELATIVE DATING is the age of the earth material in relation to another while ABSOLUTE DATING is the actual age of earth material.
  2. List and briefly explain the tools used in relative dating.

    Superposition
    Oldest rocks are on the bottom.
  3. List and briefly explain, the tools used in relative dating .

    Original Horizontality
    Rock layers that are flat are not disturbed. Sediments are deposited in a horizontal position.
  4. List and briefly explain, the tools used in relative dating.

    Cross Cutting
    A younger feature cuts through an older feature.
  5. List and briefly explain, the tools used in relative dating.

    Inclusions
    One rock unit is enclosed within another. Inclusion is younger.
  6. List and briefly explain, the tools used in relative dating.

    Unconformity
    Break (gap) in the geologic rock record due to erosion.
  7. List and briefly explain, the tools used in relative dating.

    Faunal Succession
    Fossil organisms succeed one another in a definite and determinable order.
  8. List, briefly explain, and identify the three types of unconformities.

    Disconformity
    Flatline sedimentary layers on either side are parallel.
  9. List, briefly explain, and identify the three types of unconformities.

    Angular Unconformity
    Tilted rocks are overlain by flat-layering rocks. Stress causes the tilting.
  10. List, briefly explain, and identify the three types of unconformities.

    Nonconformity
    Older metamorphic or intrusive igneous rocks in contact with younger sedimentary layers. Contact metamorphism occurs.
  11. What is correlation?
    Matching rocks of similar age in different regions

    Often relies upon fossils
  12. What is an isotope?
    Same number of protons, different number of neutrons (same atomic number, different atomic masses.)
  13. When is C-14 used?
    During recent geologic events
  14. What are the dates that divide each era in the Phanerozoic Eon.
    • Paleozoic: 542mil-250mil
    • Mesozoic: 250mil-65mil
    • Cenozoic: 65-present day

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