1. History of the Earth
Ch. 32

2. What Important Historical Events can you name and date?
Dinosaurs
Oldest Living Organism
Oldest Rock
Age of the Earth

4. Timelines…

5. Experiencing Geologic Time:
How long would it take to count to a million?
(1,000,000)
1,000,000 “yrs” 1 sec 1 min 1 hr 1 day = ≈ 6 days!
“yrs” sec 60 min 24 hr
A thousand millions is a “billion”
How many years would it take to count to a billion? (1,000,000,000)
(Show the calculation for extra credit)

6. Geologic Time at Scale: visualizing
544 my
5000 my
~ 12% of Earth History

7. Phanerozoic Eon The “ages” of Geologic Time
Hadean, Archaen and Proterozoic Eons
(the first 4.1 billion years)
Phanerozoic Eon
(the last 500 million years)
Look at page 600 in your Textbook

8. Investigating Geologic Time
Relative Time
Index fossils
Stratigraphy
Law of superposition
Unconformities
Absolute Time
Tree Rings
Sediment Layers (varves)
Radioactive decay
Microfossils, Sediments and Sea Floor Spreading
Stratigraphy Exercises
Radioactive Decay Problems
Chapter 32 Section I, II and III

9. Video Preview of Ch. 32 Video Assignment Geologic Time
Life in Earth’s Past
Events in Earth’s Past