Notes #5: Fossils.

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Presentation transcript:

Notes #5: Fossils

I. How can scientists know what organisms were around long ago??? FOSSILS Fossils are used to determine: The kinds of organisms that lived in the past The behavior of the organisms Ancient climates Ancient geography

II. Where are fossils? Most fossils are found in sedimentary rock This rock is mainly found at the bottom of lakes, streams, & oceans

III. How do we know how old a fossil is? Relative Dating- uses layers of sediment 2. Radiometric dating- Uses isotopes

IV: What types of fossils have been found? 1. A trace fossil is the marking left by an animal and may include a footprint, trail, and/or a burrow.

2. Imprint fossil: A thin object, such as a leaf, that falls into sediment can leave an imprint when the sediment hardens into rock.

3. A mold forms when an organism is buried in sediment and then decays, leaving an empty space.

4. An amber-preserved fossil is when an entire organism was quickly trapped in tree sap that hardened

5. Frozen Fossils: An entire organism was quickly trapped in ice. Example – a mammoth trapped in glacial ice.

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

Glossary Words 11.Relative dating – Fossils found in lower layers are older than fossils found in top layers

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

4. Gradualism Organisms evolve in a process of slow and constant change

5. Punctuated Equilibrium There were short bursts of quick evolution