Macroevolution 1

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Across
  1. 2. Last era of the phanerozoic
  2. 4. First period of the phanerozoic
  3. 7. This ended about 65Mya
  4. 8. The phanerozoic is a(n) ____
  5. 9. This formed about 4.6Bya
  6. 12. Which came first: jurassic or triassic
  7. 13. The paleozoic is a(n) ____
  8. 15. Middle period of the cenozoic
  9. 16. States youngest layers are found on top
  10. 17. The principle of ____ states that an intrusion is younger than the host rocks.
Down
  1. 1. This began about 3.7Bya
  2. 2. Last period of the mesozoic (when T. rex lived!)
  3. 3. Period between the ordovician and devonian
  4. 5. This began about 10Kya
  5. 6. Last period of the paleozoic
  6. 10. This ended about 250Mya
  7. 11. Period that follows the cambrian
  8. 14. The quarternary is a(n)____