The north to south climatic zonation of upper Pliensbachian ammonites known in Europe has been recognized in the North American Cordillera. This simple geographic arrangement has been disrupted by northwest trending dextral transcurrent faults. With further documentation the amount of offset of these zones should provide a measure of the amount of movement on these faults since Pliensbachian time and further document the allochthoneity of the western part of the Cordillera.

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