1. Superposition and Fossils

2. Observation
Inference

4. Absolute Aging
Gives a number

5. Relative Aging
Compares objects (older, younger)

6. Relative Aging – which is oldest?

7. Law of Superposition

8. Law of Superposition
Older rocks on bottom; younger rocks on top

9. What is a fossil?
Remains of organisms that lived in the past

10. Where do we find fossils?
Sedimentary Rock

11. What can fossils tell us?
Climates and environmental conditions in the past
Tropical fossil found in Antarctica
Aquatic fossil found in desert
Area was once a warm climate
Area was once underwater

12. Index Fossils Tells us the AGE of a rock layer
An organism that lived in only ONE geologic time period

13. Do You Know? The difference between ABSOLUTE & RELATIVE aging?
What the Law of Superposition is?
What the Law of Superposition tells us about the relative age of rock layers and fossils?
Where we find most fossils (what type of rock)?
What fossils can tell us about the past?
What an index fossil is?
What an index fossil can tell us?