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Warm-up Week 18

Warm-up Week 18. Radio carbon dating could be used to date which of the following? a. 65 MYA meteorite c. 60,000 YA metamorphic rock b. 15 MYA lava flow d. 60,000 YA tiger bone The principle of fossil succession states that different types of fossil organisms ____.

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Warm-up Week 18

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  1. Warm-up Week 18 • Radiocarbon dating could be used to date which of the following? a. 65 MYA meteorite c. 60,000 YA metamorphic rock b. 15 MYA lava flow d. 60,000 YA tiger bone • The principle of fossilsuccession states that different types of fossil organisms ____. a. succeed one another in a certain order b. generally leave behind hard parts c. are younger in the deepest layers of rock • occur most often in sedimentary rock • ________ most likely contributed to the extinction of large mammals in the late cenozoic era. a. Deadly reptile predators c. A shortage of food b. The evolution of humans d. The break-up of pangaea

  2. Q: How old is Earth? ~4.56 Billion Yrs! Q: How do you know?

  3. Uniformitarianism • Forces and processes we see today have been working thesame wayformany years. Q: What are some processes? Past Present

  4. Law of Superposition YOUNGER ↑ OLDER ↓

  5. Principle of Cross-Cutting Relationships • Anything that divides a layer is younger

  6. Which type of plant was dominant during the Cenozoic? • Which type of organism was characteristic of the Precambrian?

  7. Study Guide… • 25 Minutes. • Review. • Game.

  8. Review #2 Stromatolite = Algae!

  9. Becoming a Fossil… • _____ Burial. • _____ Parts. • Shells, bones FAST HARD

  10. Principle of Fossil Succession • Same order or creation • Index Fossils • Widespread • A___ of rocks GE

  11. Radioactive Decay • Isotopes  Stable atoms • “Half-Life” • Time for ½ of nucleus stable.

  12. Q: What fraction is left after 4 half-lives? Q: 1/8 of a sample is left. The half-life is 8 years. How old is the sample?

  13. Radiometric Dating • Calculate “birthdate” • Radiocarbon Dating • Living things • Ratio of Carbon • “Death” date.

  14. Precambrian History • ___% of Earth’s History • Earth Forms • Early A__________ Evolves 88 TMOSPHERE • Evidence: • R________ • F________ OCKS OSSILS

  15. Great Paleozoic Extinction. • Continents moved together • C_______ changed quickly • Bye Bye Organisms. LIMATE

  16. Mesozoic Life: • Mesozoic Extinction • M________ ETEOR

  17. Q: What caused the extinction at the end of Paleozoic? Pangaea  Change in Climate Q: What caused extinction at end of Mesozoic? Meteor.

  18. Cenozoic Life:

  19. Late Cenozoic Mammal Extinction HUMANS  HUNTING!

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