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Fig. 31.21. Framework of late Cenozoic fault systems of western United States. 



Fig. 31.22. Exploring the concept of extension and drift affecting western North America. 

 Black lanes represent amount of expansion as if localized along a few separations. Except 

 for the Gulf of California the extension is distributed in a number of separations across the 

 entire Basin and Range province. Small arrows represent apparent vectors of movement. Large 

 arrows the apparent resultant direction of movement. 



