Cenozoic (continued)

Laramide Orogeny

• Intermontain Basins
  
  - Unita Basin
  

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Figure 17.19, p.490

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• Northern Rockies
  
  - Lewis overthrust
  

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Eocene-Oligocene (40 myrs)

• Increase in angle of subduction
  
• Renewed magmatism
  
• Erosion of uplifts & infilling of basins
  

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Figure 17.21c, p.492

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Miocene (25 myrs)

• Epeirogenic uplift
  
• Superimposed streams
  
• Colorado Plateau
  

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Figure 17.21d, p.492

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Superimposed Streams

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Southern Big Horn Mtns., WY

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Wind River Canyon, WY

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Pacific Coast

• Farallon Plate
  
• Juan de Fuca Plate
  
• Cocos Plate
  
• San Andreas Fault
  

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Figure 17.32, p.500

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last updated 1-14-98

All original material copyright (c) 1998 by Annabelle Foos. All rights reserved.