1. Unit A Chapter 2-Fossils
Views of the Earth’s Past

2. Fossils Fossils Traces or remains of living things
They can give us clues into the following
Climate: weather conditions
Habitat: where they lived
Food: what they ate
Appearance: what they looked like

4. Original Remains Ice-whole organisms have been found in ice
Tar-thick oily liquid that preserves whole organisms
Amber-Tree Sap-traps insects on trees
Think the movie Jurassic Park

5. T-Rex in Ice

6. Woolly Mammoth found in ice

7. Tar Pits

8. Tar Pit in Downtown LA

9. Amber-Tree Sap

10. Fossil Formation Molds and Casts Petrified Wood Carbon Films
Shape of organisms remains
casts-shape was filled in with liquid rock and took shape
Petrified Wood
Stone trees-sediments pour into holes in wood and harden
Carbon Films
Imprints on rocks of entire animals
Trace Fossils-leave evidence
Footprints, trails, holes, and even feces left behind

11. Molds of Fossils

12. Let’s Make a mold
Using your play doh! and the shell. We are going to make an example of a cast
Watch as I demonstrate.

13. Casts of Fossils-the molds or space has been filled in

14. Let’s Make a Cast
Using your play doh! and the shell. We are going to make an example of a cast
Watch as I demonstrate.

15. Petrified Wood

16. Carbon Prints-Living things leaving behind the carbon in their bodies

17. Let’s Make an Imprint
Using your play doh! and the shell. We are going to make an example of an imprint
Watch as I demonstrate.

18. Trace Fossils-evidence of something that was alive

19. Let’s Make a model of a trace fossil
Using your play doh! and the shell. We are going to make an example of a cast
Watch as I demonstrate.

20. Ice Cores
Ice Core-Tubular sample that shows the layers of snow and ice
Vertical timeline
Ice traps air
Contents of air like dust and ash from volcanoes
Radiation trapped
Thicker layers mean ice ages
Thin layers mean warmer temps

21. Ice Core Samples

23. Dating of Fossils

25. Geologic Time Scale Divides the earths history into sections
Just like in Soc. Studies, the earth itself has a timeline
Divided by mass extinctions
Mass extinction: 90% of all life on the planet dies.
What benefit does this have to the ones who lived?