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Geol 202: Physical Geology

Geol 202: Physical Geology. Organization second lecture: deserts and wind action. Chapter 18 Deserts & the Work of Winds. arid lands – causes & types. Deserts worldwide. Atmospheric convection cells. Rain shadow. Sonoran Desert vegetation, Tucson AZ. ground processes in arid lands.

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Geol 202: Physical Geology

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  1. Geol 202:Physical Geology • Organization • second lecture: deserts and wind action

  2. Chapter 18Deserts &the Work of Winds

  3. arid lands – causes & types

  4. Deserts worldwide

  5. Atmospheric convection cells

  6. Rain shadow

  7. Sonoran Desert vegetation, Tucson AZ

  8. ground processesin arid lands

  9. Desert varnish, Panamint Valley CA

  10. Rock varnish, Utah

  11. Desert varnish, Death Valley

  12. Desert pavement, Panamint Valley

  13. Desert pavement pebbles, Death Valley

  14. WORK OF WATER IN DESERTS

  15. Desert landscape features

  16. Arroyo, flash flood, NE Arizona

  17. Playa

  18. Stages in pediment formation

  19. Ayers Rock, Australia – inselberg

  20. work of winds

  21. Aeolus Greek god of winds

  22. Ventifacts – Lake Vide, Victoria Valley, Antarctica

  23. Ventifacts

  24. Yardang in Roman Playa, Egypt

  25. Yardang compact lake sediment Rogers Lake Playa Southern California

  26. Desert and wind abrasion

  27. Erosion (Pillar of God) sandstone butte on pyramid of shale

  28. Colorado Plateau landforms

  29. Monument Valley

  30. Butte in Monument Valley, Arizona

  31. eolian deposition

  32. Particle size is used to distinguish among various clastic rock types

  33. Erosion of soil – Texas

  34. Erosion – St Park field, 1 m deflation since 1977

  35. Grand Mar

  36. Eolian sand ripples, Monument Valley, Arizona

  37. Ripple marks Death Valley

  38. Modern eolian ripple marks

  39. Wind dunes

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