1. Fossils Fossils are preserved remains or traces of living things.
Most fossils form when living things:
1. die
2. buried by sediments quickly.
3. bones are replaced by minerals.
4. sediments slowly harden into rock and preserve the shapes of the organisms.
Can all dead things become a fossil?

2. I can: Describe and identify different types of fossils

3. Types of Fossils Mold Cast Permineralized remains Preserved
Carbonaceous film
Trace fossil
Index fossil

4. Mold Fossil
A mold is a hollow area in sediment in the shape of an organism or part of the organism.
Forms when sediments bury an organism and the sediments change into rock.
The organism then decays leaving a cavity in the shape of the organism

5. Cast Fossil Cast is a copy of the shape of an organism.
Forms when a mold is filled with sand or mud that hardens into the shape of the organism.

6. Website

7. I can: Describe and identify different types of fossils
Do Now: Which fossil is a cast and which is a mold?
Trilobites

8. Mold – hollow area that takes the shape of an organism
Cast – copy of the shape of an organism
Mold Cast

9. Placoderm Armored Fish
-from Morocco
-about 20 feet long
-bony blades as teeth for slicing and dicing

10. Types of Fossils Mold Cast Permineralized remains
Preserved (original remains)
Carbon film
Trace fossil
[Index fossil]

11. Permineralized remains
Fossils in which spaces inside of the dead organism are filled with minerals from ground water

12. Permineralized remains

13. Preserved Fossils Original remains
Forms when entire organisms or parts of organisms are trapped in ice, tar, or amber and are prevented from decaying.
Decay means to rot or decompose

14. Ötzi the Iceman
Preserved in ice
Lived 5,300 years ago
Found in glacier between Austria and Italy

15. Megladon Shark
Body length: 100 ft
Body Weight: 80 tons

16. Baby elephant
Preserved in tar

17. Sweet Bee
Preserved in amber (a tree resin)
Extinct

18. Carbon Film Fossils
Forms when dead organisms are squeezed between layers of rock
Leaves behind the organism’s carbon imprint in the rock.
Sycamore leaf Fern

19. Trace Fossils
Form when a footprint, trail, or burrow of an organism was left behind.
Provides evidence of the activities of ancient organisms.
Size and behavior
Did it walk on two or four legs?
Did it travel alone or with others?

20. Megalosaurus footprint

23. A B C D

24. HW: p127 #1-5

25. Index Fossil Lived for a short time Found in many places
any of the six types of fossils
Found in only one rock layer
Can be used to estimate the age of rock layers
Trilobite