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By Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. Scott Babcock, Robert B. Miller

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Published by way of the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

The Cascade variety is an lively north-trending volcanic arc on the western fringe of North the US (Figure 1). on the northern finish of the diversity, among 47°N and 49°N, the common elevation raises, peaks develop into sharper, various small glaciers live on at the greater slopes, and volcanic rocks of the Cascade arc are scarce. This quarter is the North Cascades variety. The North Cascades are bounded at the west by means of the fore-arc basin of the Puget Lowland, at the south via the arc volcanic rocks of the imperative Cascades, and at the southeast by way of the back-arc flood basalts of the Columbia Plateau. The geologic id of the variety isn't so sincerely outlined to the north, however it is geographically bounded at the northeast via the Okanogan levels and at the northwest through the Fraser River, which separates the Cascades from the Coast Mountains.

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Additional resources for Accreted Terranes of the North Cascades Range, Washington: Spokane to Seattle, Washington, July 21-29, 1989

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0) Junction with WA 20 at town of Marblemount. Turn right, north. 6) Town of Newhalem (see Day 6) Above Newhalem the river has cut a spectacular canyon into the Skagit Gneiss and the narrowness and steepness of the canyon suggest that this part of the range is still rising, or has only recently stopped. T307: 42 S S' § ; Projected from south of sec,tion (:':"::''. : : .... ::: . :. Koe \:': ': :. / .....! f{;'/ { :.......... ; ;:! : . ",:') / '. :. . : .. :~' ..... ". ,i / \...... ~". ~... ~;..

Turn right onto WA 153. 6) Stop 1-1 Good exposures of the migmatite complex of Alta Lake. 3 km) beyond and walk back (see Figure 8). The Alta Lake unit consists mainly of variably migmatized amphibolite and trondhjemitic orthogneiss, with lesser biotite schist and rare quartzite [Raviola, 1988]. Migmatization resulted from metamorphic differentiation and injection, according to Raviola. These rocks resemble migmatites in the Chelan Complex of Hopson and Mattinson [1971] (see Section I) but may be separated from them by the Ross Lake fault [Raviola, 1988].

2) followed by turnoff to town of Diablo. The mountain ahead is Davis Peak. Roadcuts on the right after crossing Gorge Lake are in banded gneiss, including garnet biotite schist, amphibolite, and thin layers of (mostly) biotite tonalite orthogneiss, all threaded with coarse-grained leucotonalite (trondhjemite). Massive orthogneiss becomes more abundant to the SW and beyond Gorge Lake is the predominant rock of the canyon. 9) (160 m/525'). Newhalem was built by Seattle City Light in the late 1920s.

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