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Paleontology Study Guide Answers . Please take a sheet of paper and label it “extra info” . #1 How do scientists date material older than 50,000 years? Younger than 50,000? . Older than 50,000 = Uranium lead Method Younger than 50,000 = Carbon-14 Method.

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paleontology study guide answers

PaleontologyStudy Guide Answers

Please take a sheet of paper and label it “extra info”

1 how do scientists date material older than 50 000 years younger than 50 000
#1 How do scientists date material older than 50,000 years? Younger than 50,000?
  • Older than 50,000 = Uranium lead Method
  • Younger than 50,000 = Carbon-14 Method
3 what can fossils tell us about an area s history
#3 What can fossils tell us about an area’s history?
  • Where dry land was once under water

Example: shark tooth in Georgia

  • How the environment has changed
4 what does the law of superposition state
#4 What does the law of superposition state?
  • Younger rocks are on the top.
  • Older rocks are on the bottom.
  • Layers must be undisturbed
5 what is petrification
#5 What is petrification?
  • Mineral Replacement
  • Usually happens to wood or bones
6 list the geological era s in order from earliest to most recent
#6 List the Geological era’s in order from earliest to most recent

Precambrian

Paleozoic

Mesozoic

Cenozoic

*Currently we are in the cenozoic

Hint:

Think

Alphabet

8 what s the difference between index and trace fossils
#8 What’s the difference between index and trace fossils

Trace fossils are indirect evidence of prehistoric life.

  • Can tell us about the activityof an animal
  • Examples: Footprints, trails, poop

Index fossils are used to determine relative age.

Index fossils are widespread geographically, are limited to a short span of geologic time, and occur in large numbers.

It’s an actual FOSSIL

9 what is relative age and how do you find the relative age
#9 What is relative age and how do you find the relative age?
  • Sequence
  • Age COMPARED to other rocks
  • Older or younger
  • NO NUMBER
  • Uses:
  • Index fossils
  • Law of superposition
  • Law of original horizontality
10 what is absolute age
#10 What is absolute age?
  • Most precise
  • Gives an actual age
  • Puts a number to the age. This is why we use it!

Uses:

  • Radioactive decay
  • Carbon 14 or uranium lead
  • Half-life
11 what can scientists learn from studying fossils
#11 What can scientists learn from studying fossils?
  • Geological changes such as dry areas that were once under water
  • Organisms have become more complex and how they have evolved
  • How the environment looked in the past
  • How rock layers in different areas match up
  • How environment/animals have changed
  • The age of certain layers of rocks
12 what is uniformitarianism what is original horizontality
#12 What is uniformitarianism? What is original horizontality

Uniformitarianism – the idea that the same geologic processes shaping the Earth today have been at work throughout Earth’s history

slide20

The principle of original horizontality means that layers of sediment are generally deposited in a horizontal position.

13 how is the geologic time scale broken down
#13 How is the geologic time scale broken down

Eons-eras-periods-epochs

  • Broken up so it’s more manageable
  • Eras are broken by a huge climate change or mass extinction
14 what slows down the decaying process
#14 What slows down the decaying process

Dry

And

Freezing

Temperatures

15 what do scientists think caused the extinction of dinosaurs
#15 What do scientists think caused the extinction of dinosaurs?

Climate change

Maybe:

Pange breaking apart

Or

Asteroid causing a huge dust cloud

16 are fossil records complete or incomplete why
#16 Are fossil records complete or incomplete? Why?

Incomplete

Most organisms don’t become fossils

17 what is a catastrophic event
#17 What is a catastrophic event?

Flood, mudslide, volcanic ash, earthquake, etc.

Can lead to the formation of fossils

18 cast vs mold
#18 cast vs. mold

Mold: cavity where an organism once was (cakepan)

Cast: sediment that fills the cavity (batter)

19 how are fossils formed
#19. How are fossils formed?

Needs to have a rapid burial and have the hard parts of the organism be preserved!!!

20 what do fossil records tell us about organisms
#20. what do fossil records tell us about organisms

They’ve become more complex

One cell to humans