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Notes #5: Fossils
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Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

Jan 05, 2016

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Page 1: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

Notes #5: Fossils

Page 2: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

I. How can scientists know what organisms were around long ago???

Fossils are used to determine:

1.The kinds of organisms that lived in the past

2.The behavior of the organisms

3.Ancient climates

4.Ancient geography

Page 3: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

Most fossils are found in sedimentary rock

This rock is mainly

found at the bottom of lakes, streams, & oceans

II. Where are fossils?

Page 4: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

III. How do we know how old a fossil is?

1.Relative Dating- uses layers

of sediment

2. Radiometric dating-

Uses isotopes

Page 5: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

1. A trace fossil is the marking left by an animal and may

include a footprint, trail, and/or a burrow.

IV: What types of fossils have been found?

Page 6: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

2. Imprint fossil: A thin object, such

as a leaf, that falls into sediment can leave an imprint

when the sediment hardens

into rock.

Page 7: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

3. A mold forms when an

organism is buried in

sediment and then decays,

leaving an empty space.

Page 8: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

4. An amber-preserved fossil is when an entire

organism was quickly trapped in tree sap that

hardened

Page 9: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

5. Frozen Fossils: An entire organism was quickly trapped in ice.

Example – a mammoth trapped in glacial ice.

Page 10: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

SummaryWhat are the types of fossils and how do we know how old they are?

Page 11: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

Glossary Words

11.Relative dating –

Fossils found in lower layers are older than fossils found in top layers

Page 12: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

12. Radiometric dating

uses radioactive isotopes and their half life decay rate to get an exact age.

Page 13: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

4. Gradualism

Organisms evolve in a process of slow and constant change

Page 14: Notes #5: Fossils. I. How can scientists know what organisms were around long ago??? Fossils are used to determine: 1.The kinds of organisms that lived.

5. Punctuated Equilibrium

There were short bursts of quick evolution