September 14 th

September 14th Are you ready for some Fossil

time?

Candy TossScience style…..

In what type of rock do fossils

form?

The law of superposition helps

geologists determine the absolute age of

a rock layer. T or F

What is the law of

superposition?

What is the law of Uniformitarianism

What is the law of original

horizontality?

Explain radioactive decay

Fossil investigation

Can you name the fossil?

Migrate to each of the 12 fossil samples Complete columns 1 – 3 Complete column 4 after I place the Fact Cards

next to each fossil sample. Scrambled fossil names:

Fossil Lab

• fish • brachiopod • gastropod • trilobite • echinoderm • tree

• pelecypod • coral • shark's tooth • cephalopod • allosaur claw • fern

Quiz Answers

Date: 9/14

Section: GD

Title: Geological Dating Quiz

Page:

Quiz Answers 1.

Fossil Lab Chart – Separate Sheet of Paper

Lab AssessmentSample Observations Inference (Fossil Name)

Actual Name + Facts

1      2      3      4      5      6      7      8      9      10      11      12      

Fossil Coffee Talk

What did you discover?

What are Fossils?

Fossils are the remains or traces of prehistoric life. They are important components of sediment and sedimentary rocks. The type of fossil that is formed is determined by the conditions under which an organism died and how it was buried.

2. Altered vs. Unaltered Remains

A. Unaltered Remains• Some remains of organisms—such

as teeth, bones, and shells—may not have been altered, or may have changed hardly at all over time.

B. Altered Remains

• The remains of an organism are likely to be changed over time.

• Fossils often become petrified or turned to stone.

• Molds and casts are another common type of fossil.

• Carbonization is particularly effective in preserving leaves and delicate animals. It occurs when an organism is buried under fine sediment.

Indirect Evidence

• Trace fossils are indirect evidence of prehistoric life.

3. Indirect evidence

Trace Fossil

4. Preservation

Conditions Favoring Preservation

Most organisms do not become fossils…

• Two conditions are important for preservation: rapid burial and the possession of hard parts.

Preservation

5. What are the different kinds of fossils?

a. AmberAmber

#1 Amber

b. Asphalt&

Tar

#2 Asphalt/Tar

□Asphalt wells up in thick sticky pools.

□Trapped and preserved organisms in asphalt.

c. Petrified

#3 Petrified Fossils

□A process in which minerals replace the organism’s tissues.□Different types:

□Pore space in bone/wood fills up with mineral

□Organisms tissues are replaced by minerals

d. Frozen

#4 Frozen

e. Molds &

Casts

Molds and Casts

f. Trace

Trace

6. Environments

a. Interpreting Environments• Fossils can also be used to interpret and

describe ancient environments and changes that occurred (polar areas once being tropical)

• They can identify extinct species and effects of catastrophism (floods, volcanic eruptions, earthquakes).

• They can describe geologic changes (mountains once under water, Pangaea)

Shark tooth in Georgia?!?!

b. Fossils on a Mountaintop?

□Rocks on the mountain formed at the bottom of the ocean.

□Using fossils, scientists can tell whether the climate was cooler or more wet than present.

Title Page: Fossilization Include definitions, illustrations, and examples.How do fossils form?What are trace fossils?What are tar/asphalt fossils?What are frozen Fossils?What petrified fossils?What are mold/cast fossils?What does the fossil evidence tell us?

The Fossil Foldable – Tier 2 Fossilization