Mesozoic
(Chapter 15)

Breakup of Pangaea

• Triassic
  
  - Initial Rifting between Laurasia and Gondwana
  

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  Figure 15.4, p. 405
  

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  - Newark Group-Fault Block Basins
  - Igneous activity
  
  - Palisades Sill
  

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  Figure 15.12, p. 412
  

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  - Evaporites - Tethys Sea
  

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  Figure 15.5, p. 405
  

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• Jurassic
  
  - Separation of Gondwana continents
  - Late Jurassic
  
  - Separation of South America from Africa
  

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  Figure 15.6a, p. 406
  

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  - Benue Trough-alacogen
  

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  Figure 15.3, p. 404
  

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• Cretaceous
  
  - Continued separation of Gondwana continents
  

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  Figure 15.6b, p. 406
  

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  - Global rise in sea level due to accelerated rifting resulting in flooding of craton
  

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  Figure 4.15, p. 84
  
  Figure 15.11, p. 411
  

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• Cenozoic
  
  - Separation of Antarctica from Australia
  - Final separation of North America from Europe
  

Western North America

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Figure 15.21, p. 420

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• Sonoma Orogeny
  
  - Late Permian to Early Triassic
  - Collision of island arc with western margin of craton
  
• Nevadan Orogeny
  
  • Middle-Late Jurassic
    
    - Franciscan Group
    
    - trench sediments
    - melange
    
    - Great Valley Group
    
    - fore-arc basin
    

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Figure 15.20, p. 419

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• Late Jurassic-Cretaceous
  
  - Granite-granodiorite batholiths
  - Coast Range, Idaho, Sierra Nevada and Southern California Batholiths
  

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fig. 15.22, p.420

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- decrease in age of batholiths from west to east
- decrease in angle of subduction

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• Sevier Orogeny
  
  • Cretaceous
    
  • low angle thrust faults
    

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last updated 4-12-99

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