1. Objective 1/23/13
Identify various types of fossils.
Intro
Which of the following pictures shows a fossil? How do you know?

2. Fossils

3. Fossils What is a fossil?
The remains or physical evidence of an organism preserved by geologic processes

4. Fossils How do fossils form?
Usually, an organism is buried in a substance that helps to protect and preserve its remains.
Found only in sedimentary rocks.

5. Fossils Environmental Change Example
Fossils can be good indicators that an area has undergone environmental change
Marine fossils found in freshwater lakes
Marine fossils found on mountaintops
Desert fossils found in ice caps

6. Picture…

8. Fossils
Where can you find fossils?
Rocks
Amber
Petrifaction
Tar
Ice

9. Fossils
Rock
An animal or plant gets quickly buried in sediments, forming new rock and a fossil

10. Fossils
Amber
Insects (most common) get trapped in tree sap which hardens over time

11. Fossils
Petrifaction
Process in which minerals replace an organism’s tissues

12. Fossils
Tar (Asphalt)
Tar-pits trap animals like tree sap traps insects

13. Fossils
Warning!
Gross picture up ahead!
Ice
Ice preserves organisms very well, even their skin and organs!

14. Fossils
Other types…
Trace fossils
Molds
Casts

15. Fossils
Trace Fossils
Preserved EVIDENCE of an organism, NOT the actual organism!
Tracks
Burrows
Coprolite

16. Fossils
Molds
A cavity where something was buried

17. Fossils
Cast
Forms when sediments fill in a mold

18. Fossils Summary: What are fossils?
What are some different ways fossils can be created or preserved?

19. Identify various types of fossils.
Objective 1/20/2013
Identify various types of fossils.
Outro
Why do you think one animal or plant becomes fossilized, but millions of others do not?
Prior to 1700, the process of fossil formation was unknown. Robert Hooke observed fossils under a microscope and saw that the characteristics of a fossilized plant were similar to a living plant. From this observation, he concluded that some plants had been fossilized by mineral-rich water being deposited in the cells of the plant. This information would BEST support which conclusion?
Robert Hooke’s discover delayed advancements in science.
New evidence about fossils can change existing theories.
Prior to 1700, fossils were much more common.
Plants are more likely to form fossils.