Geology . Fig. 403.—Section in northern Montana, showing Proterozoic rock, A, thrust overCretaceous, K. Subsequent erosion has removed much of the overthrust beds,but Chief Mountain is a remnant of them. The extent of the overthrust isunknown. has been located which crowded the Cambrian rocks obliquelyup over the Cretaceous. The horizontal displacement is estimated to. Fig. 404.—Chief Mountain. (Willis, U. S. Geol. Surv.) be as much as seven miles,1 while the throw is as much as 15,00Cfeet. Near the national boundary, the displacement of what appearsto be the same fault crowded the Proterozoic
Geology . Fig. 403.—Section in northern Montana, showing Proterozoic rock, A, thrust overCretaceous, K. Subsequent erosion has removed much of the overthrust beds,but Chief Mountain is a remnant of them. The extent of the overthrust isunknown. has been located which crowded the Cambrian rocks obliquelyup over the Cretaceous. The horizontal displacement is estimated to. Fig. 404.—Chief Mountain. (Willis, U. S. Geol. Surv.) be as much as seven miles,1 while the throw is as much as 15,00Cfeet. Near the national boundary, the displacement of what appearsto be the same fault crowded the Proterozoic up over the Cretaceous2by a movement of equal magnitude (Fig. 403). The exact date of 1 McConnell, Geol. Surv. of Canada, Vol. II, Rept. D, p. 33, 1886. 2 Willis, Bull. Geol. Soc. of Am., Vol. 13, pp. 307, 331-5. 166 GEOLOGY these faults 1ms not been determined, but they occurred during thegeneral period of disturbance inaugurated at the close of the UpperCretaceous. Tin4 position of the Cretaceous near Livingston, Mont.,is shown in Fig. 405, while the effect of faulting on outcrops in theplains of Colorado is shown in Fig. 398.
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