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OUTLINE

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  1. OUTLINE • Introduction • Precambrian Earth History • The Paleozoic Geography of Earth • Paleozoic Evolution of North America • The History of Paleozoic Mobile Belts • The Role of Microplates • The Breakup of Pangaea • The Mesozoic History of North America • GEO-FOCUS 18.1:Petrified Forest National Park • Cenozoic Earth History • Geo-Recap

  2. OBJECTIVES 1 The Precambrian encompasses more than 88% of all geologic time, yet we know less about this episode in Earth history than we do about the other eras. 2 At the beginning of the Paleozoic, six major continents were present, and they assembled into the supercontinent Pangaea by the end of the Paleozoic. 3 The breakup of Pangaea took place in four general stages, beginning during the Triassic. 4 The geologic record of the Cenozoic is more thoroughly understood than the records of earlier eras. 5 An episode of widespread glaciation took place during the Pleistocene Epoch.

  3. Fig. 18-CO, p. 416

  4. Fig. 18-1, p. 418

  5. Fig. 18-2, p. 419

  6. Fig. 18-2a, p. 419

  7. Fig. 18-2b, p. 419

  8. Fig. 18-2c, p. 419

  9. Fig. 18-3, p. 420

  10. Fig. 18-4, p. 421

  11. Fig. 18-4a, p. 421

  12. Fig. 18-4b, p. 421

  13. Fig. 18-4c, p. 421

  14. Fig. 18-5, p. 422

  15. Fig. 18-5a, p. 422

  16. Fig. 18-5b, p. 422

  17. Fig. 18-5c, p. 422

  18. Fig. 18-6a, p. 423

  19. Fig. 18-6b, p. 423

  20. Fig. 18-6c, p. 423

  21. Fig. 18-6d, p. 423

  22. Fig. 18-7, p. 424

  23. Fig. 18-7a, p. 424

  24. Fig. 18-7b, p. 424

  25. Fig. 18-7c, p. 424

  26. Fig. 18-8a, p. 426

  27. Fig. 18-8b, p. 426

  28. Fig. 18-9a, p. 427

  29. Fig. 18-9b, p. 427

  30. Fig. 18-10, p. 429

  31. Fig. 18-11, p. 429

  32. Fig. 18-12a, p. 431

  33. Fig. 18-12b, p. 431

  34. Fig. 18-12c, p. 431

  35. Fig. 18-13, p. 432

  36. Fig. 18-14a, p. 433

  37. Fig. 18-14b, p. 433

  38. Fig. 18-15a, p. 434

  39. Fig. 18-15b, p. 434

  40. Fig. 18-15c, p. 434

  41. Fig. 18-16a, p. 436

  42. Fig. 18-16b, p. 436

  43. Fig. 18-16c, p. 437

  44. Fig. 18-17, p. 438

  45. Fig. 18-18, p. 439

  46. Fig. 18-19, p. 440

  47. Fig. 18-20a, p. 441

  48. Fig. 18-20bc, p. 441

  49. Figure 1a, p. 442

  50. Figure 1b, p. 442