1. Evolution through
FOSSILS

2. Warm Up /18/2017
Directions: Read the article and answer the following questions in your notebook.
1. How do ice cores tell us about our climate past? explain....
2. How are ice core samples and earth rock core samples similar & different?
a. Both tell about our Earth’s past, but ice cores tell us about movement of our plates & rock cores tell us about our climate’s past.
b. Both tell us about our climate history, but ice cores tell us about our cold climates & rock cores tell us about our warmer climates.
c. Both tell us about our Earth’s past, but ice cores tell us about our climate’s past & rock cores tell us about life’s past.

3. 3. Which would make the best INDEX fossil? Explain WHY!!!!

4. Warm Up April 6, 2016
How do scientists determine the relative ages of rocks, fossils, or events during the history of the Earth?
How do scientists determine the absolute age of rocks or fossils?
Provide one piece of evidence to support the theory of evolution?
Objectives: 8.L.4.1
-TSWU the theories of evolution by comparing fossils of once living organisms.
Essential Questions:
-What are the 6 different types of fossils?
-What evidence do scientists use to support the theory of evolution?

5. What evidence do scientists have to prove that life has evolved on Earth?

6. Evolution through fossils

7. Six Types of Fossils*
Mold
Cast
Petrified
Preserved
Carbonized
Trace

8. Mold*
Forms when sediments bury an organism and the sediments change into rock; the organism decays leaving a cavity in the shape of the organism.

9. Cast*
Forms when a mold is filled with sand or mud that hardens into the shape of the organism

10. Petrified*
Forms when minerals soak into the buried remains, replacing the remains, and changing them into rock.

11. Preserved*
Forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber.

12. Carbonized*
Forms when organisms or parts, like leaves, fish, etc., are pressed between layers of soft mud that hardens, leaving the carbon imprint in the rock.

13. Trace*
Forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind.

14. Where do paleontologists find these fossils?
Most ancient signs of life are:
crunched in layers of metamorphic rock;
melted by heat;
weathered away by trees, wind erosion, rushing water;
or just rocked by man

15. But when paleontologists are lucky enough to find fossils & carefully extract them…

16. Fossil Lab
FOSSIL LAB!

17. MODIFIED Fossil Lab Sheet Number each fossil 1-18. already done
Use the chrome books to identify the fossil name. already done
Sketch a picture of the fossil.
Describe what type of organisms this was (aquatic or terrestrial).
What Era did this organisms live in on the geologic time scale?
Would this fossil make a good index fossil? Why?
MODIFIED

18. Fossil Lab Analysis Questions…
1. Describe the process by which fossil casts are made. (use the words sediment & mold in your answer)
2. How is a petrified fossil different from a cast fossil?
(use the words minerals & sediment in your answer)
3. How is a fossil mold different from a trace fossil of a footprint?
Looking at each fossil from the lab, in what types of environments would you expect to find each ancient organism?
Suppose you were in Charles Darwin’s shoes in the mid 1800’s and wanted to present the very first theory of evolution to other scientists around the world. What types of evidences would you present to prove your theory of evolution? Write a 1-2 paragraph letter to other paleontologists around the world persuading your colleagues to accept your hypothesis.

19. Evidence of Evolution …
Fossil Records
Homologous Structures: similarities in physical characteristics between species.
Vestigial organs
DNA
Embryos