Figure 2.17   Displaced faunas in terranes within the North American Cordillera together with changing provincial boundaries on the craton. Postulated latitudinal boundaries on the craton during the Permian, Triassic and Jurassic are indicated and confi rm the northern movement of these displaced terranes. A dataset of Jurassic ammonoid distributions across the cordilleran terranes is available at These data may be analyzed and manipulated using a range of multivariate techniques including cluster analysis (see also Hammer & Harper 2005). (From Hallam, A. 1986. J. Geol. Soc. 143.)

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