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1980)— sitting on formerly continuous basements. , 2006). However, the presence of Archean basement beneath allochthons in several widely separated locations, such as the Grouse Creek–Albion–Raft River, the Pioneer, and the Priest River complexes (Fig. 5), suggests that the Selway terranes, as well as other areas of Precambrian crystalline basement in the thrust belt, such as the Farmington and Santequin complexes, are Rubian basement and are sitting structurally upon the western margin of the Archean Wyoming craton.

Archeocyathid-bearing limestones and Neoproterozoic diamictite occur all along the Cordillera, but they are missing from the Columbia triangle. ATL—Atlanta lobe of Idaho batholith; B—Butte, Montana; BB—Boulder batholith; BIT—Bitterroot lobe of Idaho batholith; BM—Blue Mountain–Wallowa terranes; C—North Cascades; O— Orcas Island; SRF—approximate trace of proposed Snake River fault; wisz—Western Idaho shear zone. U S A na da Ca S m tfor n k i i S t i Qu a Co as lu tP to ni c m Co pl Va o nc uv es er ll i ex Is C r e ek of a Columbia Triangle rz o sh ne el el l Canadian Segment e BM alt ea ay sh en ino e ba s Or ne Miocen C C ot Ko O Sylvester allochthon sm am at t Range volcanics pla ra on 3 M a Co as ti agma Ma m Late Cretaceous early Tertiary slab break-off plutons he 7 53– 4 i ll e limit of Cord rb 6 ar ssi te r n br ca i an 0– 5 C a r m a ck s Cac ea s nt s wisz n F.

2008), showing the distribution of some exotic terranes within the Rubian superterrane, Cordilleran-type batholiths, and various plutonic suites, including slab break-off plutons and volcanic rocks. Insets show the doubled Cordilleran batholiths in the Canadian Cordillera and a possible reconstruction of Cordilleran batholiths on the Rubian supercontinent. Note how the Lewis and Clark lineament appears to control the northern boundary of the Laramide thick-skinned deformation, whereas the northern boundary of the geomorphological Colorado Plateau appears to be controlled by the Orofino shear zone.

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