Your SlideShare is downloading. ×
P P T  Fossils 9
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

P P T Fossils 9

18,117

Published on

5 Comments
12 Likes
Statistics
Notes
  • On the last slide, the picture covers the information. Is that on purpose or is that an accident??
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • goooooooooooooooooooood
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Excellent resource for year 10. All what they need to know.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • nice work
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • I found a great informative post for this 'P P T Fossils 9'. I am very impressive from this article post. Great Job very nice present information. I like very much this 'P P T Fossils 9 '. I have more interest in Dinosaurs Research Field. I like Dinosaurs Related News. my Dinosaurs related Social blog is http://dinosaurs-video.blogspot.com
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total Views
18,117
On Slideshare
0
From Embeds
0
Number of Embeds
9
Actions
Shares
0
Downloads
984
Comments
5
Likes
12
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. FOSSILS Chapter 9, Section 1
  • 2. Think About It . . .
    • Can you name any dinosaurs?
    • Do you know what they looked like or how they moved?
    • Scientists have been able to tell us many things about organisms (such as dinosaurs) that lived millions of years ago.
    • How do scientists learn about these organisms if they’ve never seen them?
  • 3. Fossils!
    • Fossils = the remains or imprints of an organism that lived long ago.
    • Fossils can be formed in five different ways. . .
  • 4. 1) Fossils in Rocks
    • Usually when an organism dies, it begins to decay right away.
    • But sometimes organisms are buried by sediment when they die.
    • Sediment can preserve the organism.
    • Hard parts (shells, teeth, bones) are preserved more often than soft parts (skin, organs).
    • These parts become fossils when the sediment hardens to form a sedimentary rock.
  • 5. 2) Fossils in Amber
    • Sometimes organisms (such as insects, frogs, and lizards) are caught in sticky tree sap.
    • If the sap hardens around the insect, a fossil is created.
    • Hardened tree sap is called “amber.”
  • 6. 3) Frozen Fossils
    • Ice and cold temperatures slow down decay.
    • Fossils can be preserved in blocks of ice.
    • Fossils of woolly mammoths, relatives of elephants that went extinct 10,000 years ago, have been found in ice.
  • 7. 4) Petrification
    • Minerals can replace tissues (organs, muscles, skin)
    • In animals, minerals fill the tiny spaces in the hard tissues (like bone)
    • In trees, minerals replace the wood, so the wood becomes rock.
  • 8. 5) Fossils in Asphalt/Tar
    • In some places, asphalt can bubble and form sticky pools of tar.
    • The La Brea Tar Pits in L.A. are at least 38,000 years old.
    • These pools have trapped and preserved many different organisms, like the saber-toothed cats & dire wolves.
    • From these fossils scientists have learned about what California was like 10,000 to 40,000 years ago.
  • 9. Trace Fossils
    • Organisms can leave behind clues about their lives that are also fossils.
    • These clues were made by an organism, but they do not include parts of the organism’s body.
    • This is called a trace fossil.
    • For example, fossils of footprints / tracks tell scientists how big the animals was and how fast it moved.
  • 10. Other Examples of Trace Fossils
    • Burrows (shelters made by animals that bury themselves in the sediment) may be filled with sediment and preserved.
    • “ Caprolites” = dung (“poop”) that is fossilized.
  • 11. Molds & Casts
    • Mold = the print/impression left in sediment/rock where the plant/animal was buried.
    • Cast = forms when sediment fills a mold and becomes rock.
    • Both can show what the inside or outside of an organism looked like.
  • 12. What Can Fossils Tell Us?
    • Fossils can show scientists 3 main things:
      • The kind of organism that lived in the past
      • How the environment has changed (ex: forest fossils found in Antarctica show the climate was much warmer in the past)
      • How organisms have changed
  • 13. How Old Is It?
    • To understand the history of the Earth, scientists have put fossils in order based on their ages.
    • They use relative dating and absolute dating methods
  • 14. Index Fossils
    • Fossils of certain types of organisms can be found all over the world.
    • But these fossils are found only in rock layers of a certain age.
    • These are called index fossils.
    • When scientists see a specific index fossil, they know right away how old it is
    • Ex: When scientists find Phacops in a rock layer, they know the rock layer is 400 million yrs old.
  • 15. Pop Quiz
    • What is a fossil?
      • The remains or imprints of an organism that lived long ago.
    • What are 5 different ways fossils can form?
      • In rock, amber, ice, asphalt, or by petrification
    • What 3 things can fossils tell us?
      • The kind of organism that lived in the past
      • How the environment has changed
      • How organisms have changed
    • Who loves fossilized poop (caprolites)?
      • We all do!

×