1. Geologic Time

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3. Activity 3: Geologic Time Get Started Sketch this timeline in your science notebook:

4. Activity 3: Geologic Time Get Started  First cells preserved in the fossil record  Dinosaurs became extinct.  “Ardi,” a skeleton observed in the fossil record, who lived in Ethiopia. Label on your timeline where you think the following events occurred:

5. Activity 3: Geologic Time Introduction  Deep time or geologic time is the vast time scale of billions of years, related to the geological and evolutionary history of the earth. Read the Introduction.

6. Activity 3: Geologic Time  What are the key events of geologic time? Challenge

7. Activity 3: Geologic Time Procedure  Find a partner from another group and discuss your ideas about which statements are accurate and which are not accurate.  Cite evidence from past science classes or reliable sources.  Ask each other questions.  Be prepared to share your ideas. Fill out the “Before” column on Student Sheet 3.1, “Ideas about Evolution”

8. Activity 3: Geologic Time The Geologic Time Scale

9. Activity 3: Geologic Time The Geologic Time Scale

10. Activity 3: Geologic Time Follow Up  How does the football field model illustrate the concept of geologic time?

11. Activity 3: Geologic Time Follow Up  In four to six sentences summarize the geologic timeline and major evolutionary events. Analysis 1

12. Activity 3: Geologic Time Follow Up  What patterns do you notice in the changes of life through geologic time?

13. Activity 3: Geologic Time Follow Up  First cells observed in the fossil record ◦ 3,500 mya or 77.8 yds on a football field  Dinosaurs became extinct ◦ 65 mya or 1.4 yds on a football field  Ardi observed in the fossil record ◦ Approximately 4.4 mya or 0.1 yds on a football field

14. Activity 3: Geologic Time  What are the key events of geologic time? Revisit the Challenge

15. Activity 3: Geologic Time  biodiversity  deep time  extinct  extinction  geologic time  geologic time scale Key Vocabulary