2. Part II
Types of Fossils

3. Types of Fossils:
Molds
Casts
Trace fossils
Petrified fossils
Body

4. Mold fossils- a visible empty space that was left after an organism was buried in sediment and then decayed
CLAY DEMONSTRATION

5. Example of a Mold Fossil

6. Cast fossils- Minerals in rocks fill a space left by a decayed organism
If a space in the imprint is filled with minerals when the original animal or plant part dissolved, it is called a cast.
Cast fossil

7. Example of a Cast Fossil

8. HOT Question: Why do you think scientists have rarely found a fossilized jellyfish?
Answer: They have soft bodies

9. PowerPoint 5
3. Trace Fossil- Markings left by an animal (footprint, trail, or burrow)
A footprint of an animal
is called a Trace Fossil

10. Example of a Trace Fossil

11. 4. Petrified Fossil- Minerals enter and replace the hard parts of an organism

12. Petrification This is the most common method of fossil preservation.
The shape of the original plant or animal is preserved as rock.
Sometimes the original material is dissolved away leaving the form and structure but none of the organic material remains.

13. Petrified forest in Arizona

14. 5. Body Fossil
Unaltered remains of organisms in natural preservatives (amber, tar, frozen ground)

15. Natural Preservatives
Scientists have discovered fossils in the following natural preservatives
Original Remains
Tar- La Brea Tar Pits in Los Angeles
Amber-preserved is a rare fire beetle
Frozen Ground-Frozen baby mammoth found in the permafrost of Siberia
goofyblog.net/news-baby-woolly-mammoth-found/

16. Trace fossil
Petrified
Fossil
Cast

17. Discovery Education: Natural Preservatives

18. Review Types of fossils are: Mold Fossils Cast Fossils Trace Fossils
PowerPoint 6
Review
Types of fossils are:
Mold Fossils
Cast Fossils
Trace Fossils
Petrified Fossils

19. A B
What kind of fossil is it? On your paper identify what type of fossil A-F is on pg. 22. C D A E F

20. A B
What kind of fossil is it? A-Petrified B-Cast C-Mold D-Mold E-Body F-Trace C D E F