Students are working to understand how rocks tell the history or Earth. Presentation includes fossils and rock layers.

1. Exploration of Earth History
What evidence can we find in rocks?

2. Rocks tell the story of Earth’s History
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Red Rock Canyon CO
Devil’s Tower
Wyoming
Painted Desert
Arizona

3. Rocks tell the story
Link for image
Rocks can provide evidence
Age of the Earth
Type of organisms
Evolution of Species
Environmental Changes

4. Original Remains
Fossils that are the actual bodies or body parts

5. Who is ICE MAN?
Who needs Ice if you have
Maverick?

6. Ice Man from Himalayans
5,300-year-old corpse turned up on the mountain border between Austria and Italy in 1991

7. Ice Man Trapped

8. Ice Man Close Up

9. Inferences from NatGeo

10. Trapped in Amber

11. Tar Pits

12. Fossils in Sedimentary Rocks
Image Link
Mold: hollow area left by the living thing
Cast: solid mineral deposit that filled the mold, leaving a copy
Image Link

13. Trace Fossils
Trace: tracks, burrows, nests
Image Link
Image Link

14. Petrification
tissue replaced by minerals

15. Carbon Films

16. Ice Core Samples

18. Relative Dating
How old something is in comparison
to something else

19. Index Fossils
Only
around
for short
periods of
time

20. Ammonite
Found in sedimentary rock layers
about 400 million years ago

21. Trilobite
Fossils show:
Biodiversity
How species have changed over time
Correlation between rock layers from around
the world
Relative ages to particular strata
Evidence for the geological time scale

22. Law of Superposition
Law that states the older layers were laid down first, then
younger materials was put down on top of it
Younger Igneous Rock
can cut through rock layers

23. Closer Look at Rock Layers
Do you see evidence of
Erosion
Earthquake
A river

24. Principles of Crosscutting
The geologic feature which
cuts another is the younger
of the two features

25. What kind of rocks are these fossils in?
Which layer is oldest?
Which layer is youngest?
How do you know?

26. Intrusions vs Extrusions
Intrusion: when magma
cools within the earth
Always younger than the rock around it
Extrusion: when lava
cools outside the earth
Image A Image B
Image C

27. Is this an Igneous Intrusion?

28. What evidence do we see in these
Road Cuts?
Image A Image B Image C III
Image D Image E Image F

29. Did the fold happen before the red rock was deposited?

30. What could have caused F? When did it happen?

31. Did the eruption happen before or after layer H?

32. What story does these rocks tell?
Where is the river?

33. Between which two layers was a fast moving river?

34. Absolute Dating
The actual age of the event
Half Life: the length of time it takes for half of the atoms
in a sample of a radioactive element to change from an
unstable form into another form