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Geologic Wonders of Central Texas

Geologic Wonders of Central Texas. by Dr. Leon E. Long Outreach Lecture Series Volume 17.

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Geologic Wonders of Central Texas

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  1. Geologic Wonders of Central Texas by Dr. Leon E. Long Outreach Lecture Series Volume 17 Produced by and for the Outreach Lecture Series of the Environmental Science Institute. We request that the use of any of these materials include an acknowledgement of Dr. Leon E. Long and the Outreach Lecture Series of the Environmental Science Institute of the University of Texas at Austin. We hope you find these materials educational and enjoyable.

  2. Dr. Leon E. Long Department of Geological Sciences Geologic Wonders Of Central Texas Geologic Wonders Of Central Texas

  3. image 1 - Two divisions of Texas along an S-shape line that passes through Austin

  4. image 2 - Texas average annual rainfall; climatic impact on the landscape

  5. image 3 - Geologic map of Texas

  6. North-Central Texas image 4 - North Central sub-province Austin

  7. image 5 - Gulf Coastal Plain sub-province Gulf Coastal Plain Austin

  8. image 6 - Trans-Pecos sub-province Austin Trans-Pecos

  9. image 7 - High Plains sub-province Austin

  10. image 8 - Edwards Plateau sub-province Austin

  11. image 9 - Cretaceous interior Seaway

  12. image 10 - Llano Uplift sub-province Austin

  13. image 11 - Orientation map showing Austin astride (or near to) three sub-provinces

  14. image 12 - Llano Uplift basement geology

  15. image 13 - Geologic timescale; ages of formation of rocks in the Llano Uplift

  16. image 14 - Inverse geologic timescale; ages of erosion or non-deposition in the Llano Uplift

  17. image 15 - Orientation; Enchanted Rock batholith within the Llano Uplift

  18. image 16 - Oblique aerial photo of Enchanted Rock

  19. image 17 - Major minerals in granite

  20. image 18 - Igneous intrusive origin of granite

  21. image 19 - Photo from top of Enchanted Rock showing adjacent exfoliation dome

  22. exfoliation sheet image 20 - Photo of exfoliation sheets popping off

  23. image 21a - Photo of joints in granite; joints v. faults

  24. image 21b - Photo of joints with labels

  25. image 22 - Weathering attack of granite

  26. image 23 - Photo of rounded granite boulder

  27. image 24 - Vertical aerial photo of rounded exfoliation domes at enchanted rock

  28. image 25a - Photo of view to the south; Cretaceous escarpment; rate of weathering of granite

  29. image 25b - View to the south with labels

  30. image 26a - Photo of view to the east; Riley Mountains

  31. image 26b - View to the east with labels

  32. image 27 - Ages of rocks symbolized in the preceding image

  33. image 28 - Geologic map of Enchanted Rock and vicinity

  34. image 29 - Map showing all 3 types of geologic contac: depositional (Cretaceous escarpment), fault (Riley Mountains), and igneous intrusive (Enchanted Rock batholith)

  35. image 30 - Stage I of landscape development (form the rocks)

  36. image 31 - Stage II (deform the rocks) and Stage III (erode the rocks); inversion of topography

  37. Image 32a - Fault drag at Hoover Point

  38. Image 32b - Fault drag at Hoover Point with text

  39. Image 33 - Fault Zone

  40. image 34 - Geologic map showing Sandy Creek

  41. image 35 - Landscape development I

  42. image 36 - Landscape development II

  43. image 37 - Landscape development III

  44. image 38 - Landscape development IV

  45. image 39 - Landscape development V

  46. Image 40 - Braided stream vs. meandering stream

  47. image 41 - Granite weathering into grus

  48. Image 42 –Granite grus

  49. Image 43 – Sandy Creek

  50. Image 44 – Orientation map of Austin and vicinity

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