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Key terms: geologic time, geologic time scale, eon, era, period, epoch.

LEQ: : What is Geologic Time? How can a model help me visualize the length and vastness of geologic time? What is the Geologic Time Scale? What are the units of the Geologic Time Scale?. Key terms: geologic time, geologic time scale, eon, era, period, epoch. Appreciating Geologic Time.

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Key terms: geologic time, geologic time scale, eon, era, period, epoch.

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  1. LEQ::What is Geologic Time? How can a model help me visualize the length and vastness of geologic time? What is the Geologic Time Scale? What are the units of the Geologic Time Scale? • Key terms: geologic time, geologic time scale, eon, era, period, epoch.

  2. Appreciating Geologic Time • Getting a personal vision of geologic time is a concept that is critical in Earth Science. • An easy way to get a vision of geologic time is when you begin to get a good concept of the vastness of geologic time. • A model is very helpful.

  3. Lets Start with Numbers (and the power of 10) • On your notes page, print the following number: • One Thousand • 1,000 • One Hundred Thousand • 100,000 • One Million • 1,000,000 • One Hundred Million • 100,000,000 • One Billion • 1,000,000,000

  4. Asterisks on the page • Number of asterisks on the page: • 2000 • Number of pages needed for 1 million asterisks • 500 • Number of asterisks in a ream of paper: • 1,000,000 • Number of asterisks in a case of paper: • 10,000,000

  5. Modeling • Lets use the asterisks to help us make a model. • Each asterisk is 1 year. • Number of years on one page: • 2000 years • Number of pages needed for 1 million years • 500 pages • Number of years in a ream of paper: • 1,000,000 years • Number of years in a case of paper: • 10,000,000 years.

  6. Units of time • Work with a partner, and list the following units of time from the largest to the smallest: • Hour Day • Millennium Century • Year Week • Month Second • Minute Decade

  7. Earth’s Age • Earth’s age is estimated to be: • 4.6 billion years old. • 4,600,000,000 • Number of cases for 4,600,000,000: • 460 cases • With each case having 5000 pages and each page having 2000 years.

  8. Geologic Time • Earth’s history has been 4.6 billion years in the making. • This history is known as geologic time.

  9. The Geologic Time Scale • Because the span of Earth’s past is so great, geologists use the geologic time scale to show Earth’s history. • The geologic time scale is a record of • Life forms in Earth’s History. • Geologic events in Earth’s History.

  10. Units of Geologic Time • In a similar way we divide time into units, geologists divide Geologic time into units. • Units of geologic time (largest to the smallest): • Eon • Era • Period • Epoch • Each eon, era, period, and epoch is given a specific name.

  11. What time is it? (in Geologic Time) • We currently live in the: • Holocene Epoch of the: • Quaternary Period of the: • Cenozoic Era of the: • Phanerozoic Eon

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