Cenozoic
(Chapter 17)

Laramide Orogeny (70-50 myrs)

• Subhorizontal Subduction
  

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• Lack of batholithic intrusions
  
• Deformation far inland
  
• Fault bounded uplifts
  
• Thick skin tectonics
  

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Figure 17.18, p.489

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• Basement Cored Uplifts
  

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Aerial Photo of Rocky Mountains

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Dakota Hogback, Denver CO

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Shell Canyon, WY

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Seminoe Reservation, WY

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Core of uplift where Precambrian rocks
are exposed at Seminoe Dam

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Reverse fault between Precambrian basement
and Cambrian Flathead SS

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Syncline, Triassic Chugwater Group in tough of syncline,
with hogbacks of Pennsylvanian Tensleep Fm on the flanks.

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last updated 1-14-98

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