1. Evidence of Life in the past
Fossils
Evidence of Life in the past

2. Why are fossils so important for the study of Historical Geology?

3. Conditions for Fossilization
Rapid burial
Hard parts- bones, shells, teeth
Why is rapid burial important?

4. Petrified Fossils Wood-mineral rich water soaks into the pores
Mineral replacement

5. Mold/ cast Mold is the impression made by organism.
Cast is when the impression fills with sediment and is lithified.

6. Carbon films

7. Original preservation
Ice man- Otzi, found in the Alps, preserved in ice 5400 years old

8. Trace Fossils- tracks, worm holes, Scat

9. Activity Create a mold and a cast of one of the provided fossils.
Use a small ball of clay to create an impression(mold).
Use plaster to fill the mold(cast) and let it dry overnight.
Show me your mold and cast tomorrow for credit.