CD/Web Review Questions

Chapter 12, The Proterozoic Eon of Precambrian Time

  1. What kind of sedimentary deposits mark the Proterozoic Eon? Hint

  2. Are there more sedimentary rocks of Archean age or of Proterozoic age still in existence? Hint

  3. Why? Hint

  4. In what three periods did the Appalachian orogenies occur? Hint

  5. What is the sequence of events exemplified by the Wopmay orogeny called? Hint

  6. What is the Trans-Hudson orogen? Hint

  7. Name three mechanisms by which continents evolved during the Proterozoic Eon. Hint

  8. Oxygen levels in the Archean atmosphere were less than 1% of present levels. By about 1.8 billion years ago, what percentage of present levels had the atmospheric oxygen concentration reached? Hint

  9. What are the Ediacara fauna and what is their significance? Hint

  10. In which of the following localities have Proterozoic fossils been found? Bitter Springs Formation (Australia), Yellowstone hot spot (North America), Mistaken Point (Newfoundland), the Red Sea. Hint

  11. What is probably the most common and widespread Vendian fossil? Hint

  12. How large were the largest of the primitive animals whose fossils have been dated to the late Proterozoic ? Hint

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