1. Introduction to the Geologic Eras & the Paleozoic Era
Ms. Stottlemyer
6th Grade Science
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2. How old is planet Earth?
The Earth and solar system are about 4.7 billon years old!

3. Fossils and Rocks (Radiometric Dating)
What are some clues on planet Earth that help scientists determine the age of our planet?
Coral Growth Bands
Tree Rings
Ice layers in glaciers
Fossils and Rocks (Radiometric Dating)

4. What is radiometric dating?

5. The Geologic Timescale

6. The Geologic Time Scale
Scientists examine changes in rock formations to determine different time periods on planet Earth.
The geologic time scale examines when different types of plants and animals appeared and disappeared from Earth.
Geologic time is broken down into eons, eras, periods, epochs and ages.

7. Smallest Amount of Time
Geologic Time Scale
Eon
Era
Period
Epoch
Age
Largest Amount of Time
Typically only used for the Cenozoic Era
Smallest Amount of Time

8. Geologic Time Scale Terms
EON: Two or more geological eras form an Eon, which is the largest division of geologic time, lasting many hundreds of millions of years.
ERA: Two or more geological periods comprise an era, which is hundreds of millions of years in duration.
PERIOD: The period is the basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.
Definitions are from enchantedlearning.com

9. Geologic Time Scale Terms
EPOCH: An epoch is a division of a geologic period; it is the smallest division of geologic time, lasting several million years.
AGE: An age is a unit of geological time which is distinguished by some feature (like an Ice Age). An age is shorter than an epoch, usually lasting from a few million years to about a hundred million years.
Definitions are from enchantedlearning.com

10. Geologic Time Scale Terms Diagram
Reference:
Geisen, M. (2016). History of Life on Earth. In Everything You Need to Ace Science in One Big Fat Notebook (pp. 465). New York, NY: Workman.

11. Geologic Time Scale Chart

12. Geologic Time Scale Chart
Reference:
Geisen, M. (2016). History of Life on Earth. In Everything You Need to Ace Science in One Big Fat Notebook (pp. 466). New York, NY: Workman.

13. References
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[Chart]. Retrieved from
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[Diagram]. Retrieved from
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[Diagram]. Retrieved from tric+Dating.jpg
[Image]. Retrieved from gMzmClOq2TQ/Viz6YtQ1LqI/AAAAAAAAAKA/pNCoX3NbIu8/s1600/lifeline1.jpg
[Image]. Retrieved from solsys/solarsys_poster.jpg
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14. References
[Image]. Retrieved from devonian-periods-6638.jpg?cb= [Image]. Retrieved from /4/3/5/8/ / _orig.png [Image]. Retrieved from 01/07/19/91/240_F_ _xf4A2i1Ly16 48D1UkInp2EioahWWsQNf.jpg [Image]. Retrieved from in/700x350/filters: fixed_height(100,100):origin()/pre09/dfc2/th/pre/i/2012/220/c/d/paleozoi c_fish__contest_inside___by_dragon_frog-d5ae54z.png [Image]. Retrieved from thumb/c/cb/Pangaea_continents.svg/869px-Pangaea_continents.svg.png [Photograph]. Retrieved from rqxg/ThFVhVgx8TI/AAAAAAAAAG8/VhMp5oPo6Ao/s1600/fossilrock.JPG [Photograph]. Retrieved from fall2009/photos/glacier2.jpg [Photograph]. Retrieved from parks/gtime [Photograph]. Retrieved from [Photograph]. Retrieved from ee61749f6bae a16e30cb18c6ca%2BIMAGE%2BIMAGE.1

15. References
Bagley, M. (2014, February 22). Devonian Period: climate, animals & plants. Retrieved from Bagley, M. (2016, May 27). Cambrian Period: facts & information. Retrieved from EnchantedLearning. (n.d.). Geologic Time Periods: ZoomDinosaurs.com. Retrieved from EnchantedLearning. (n.d.). Zoom Dinosaurs EnchantedLearning.com. Retrieved from /dinosaurs/ Geisen, M. (2016). History of Life on Earth. In Everything You Need to Ace Science in One Big Fat Notebook (pp ). New York, NY: Workman. Walking Trilobite animation by S. M. Gon III [Animation]. (2000). Retrieved from