EART 3 Geology of National Parks 11404

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EART 3- Geology of National Parks 1/14/04

• OUTLINE
• Review key concepts from last class- volunteer (5
  pts)
• Mesozoic and Cenozoic history of the Colorado
  Plateau- Zion and Bryce National Parks
• Movie- Visit to the North Rim of the Grand
  Canyon, Zion and Bryce
• CONCEPTS
• Geologic provinces share a common geologic
  history-similarities between GC, Zion, and Bryce
• Sedimentary environments change as a function of
  time

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QUIZ Question

• When massive rock units like the Navajo Sandstone
  in Zion National Park are buried and subsequently
  unroofed by erosion, the decrease in pressure
  often results in
• A) metamorphism
• B) regression
• C) exfoliation
• D) disconformities

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Key Points From Last Class

• Igneous rocks intruding metamorphic rocks are
  indicative of mountain building
• Tilted sedimentary rocks indicate a period of
  deformation occurred after they were deposited
• Flat lying sedimentary rocks overlying either I
  or II indicate a period of erosion and an
  UNCONFORMITY
• Compressional forces can produce folding and
  faulting
• Tensional forces result in rock thinning, hot
  material rising toward the surface (possibly
  breaching the surface) and land uplift

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.5-.25 by
.8-1.25 by
1.8-2.0 by
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Volcanics
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Red Arch
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White Arch
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Awahnee Lodge Yosemite
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The Patriarchs
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Checkerboard Mesa
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The Narrows
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Volcanism
Rising of plateau Normal Faulting
Tensional forces
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