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Fossils and the Rock Record

Fossils and the Rock Record. The Geologic Time Scale Relative and Absolute-Age Dating of Rocks. Objectives. SWBAT : Distinguish between eons, eras , periods, and epochs. Describe the geologic time scale Vocabulary : Geologic Time Scale Uniformitarianism

kathryn-ballesty
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Fossils and the Rock Record

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  1. Fossils and the Rock Record The Geologic Time Scale Relative and Absolute-Age Dating of Rocks

  2. Objectives SWBAT: • Distinguish between eons, eras, periods, and epochs. • Describe the geologic time scale Vocabulary: Geologic Time Scale Uniformitarianism Eon Original Horizontality Era Superposition Period Cross-Cutting Epoch Unconformity

  3. The Geologic Time Scale • A record of Earth’s history from its origin 4.6 billion years ago to the present. • In a one calendar year depiction of the time scale, when do you think humans would show up? • Claymation Video

  4. The Scale in One Year • January 1st: Earth Forms • November 16th: “Life” • December 1st: First fish • December 3rd: First land plants • December 14th: Largest extinction (greater than 90% species die) • December 17th: Dinosaurs Appear • December 27th Dinosaurs Die • December 31st: 9:00pm Early Humans, 10:30pm Modern Homo Sapiens

  5. The Breakdown • Eon: longest unit of time, measured in billions of years. (Archean, Proterozoic, Phanerozoic) • Era: measured in hundreds of millions of hears. (Mesozoic, Cenozoic, Paleozoic) • Periods: measured in tens of millions of years. (Jurassic, Cretaceous, Triassic) • Epoch: smallest division, measured in millions of years. Ex: Paleocene

  6. What have you learned? • What is the longest unit of time on the geologic time scale? • Which of the following are eras? • Cenozoic • Tertiary • Mesozoic • Jurassic

  7. Lets Explore! • Come up with a creative way to show the Geologic Time Scale. My example: a football field. • Work in groups at your tables. Use the two time scale charts and pick 8-10 events that you think are important enough to present in your own scales. • We will present them after you are done!

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