Download Accreted Terranes of the North Cascades Range, Washington: by Rowland W. Tabor, Ralph A. Haugerud, Edwin H. Brown, R. PDF

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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 through 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 typical elevation raises, peaks turn into sharper, quite a few small glaciers continue to exist 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 through the fore-arc basin of the Puget Lowland, at the south by way of the arc volcanic rocks of the critical Cascades, and at the southeast by way of the back-arc flood basalts of the Columbia Plateau. The geologic identification of the variety isn't really so basically outlined to the north, however it is geographically bounded at the northeast by means of the Okanogan levels and at the northwest by way of 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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Most years, visitors here will hear and see ice falling from the glaciers. We board vans for remainder of field trip and: has no foliation. The Marble Creek pluton, a hornblende-biotite metatonalite gneiss of essentially the same age (-76 Ma), crops out about 4 km to the north but in contrast is strongly defonned, especially at its northern end. ) metamorphism, such as those here, to rocks of the Skagit Gneiss that were further metamorphosed in the Paleocene and Eocene. 6) Bridge across the North Fork of the Cascade River.

0 Retrace route to Twisp and junction with the Twisp River Road. Reset odometer and turn right (west). 2) Stop 2-1 Steeply-dipping sandstone, shale, and chert-pebble conglomerate of the Virginian Ridge Formation of Barksdale [1948]. The shales show weak pencil structure. Albian and older sub-Virginian Ridge strata are marine and east-derived [Barksdale, 1975; Tennyson and Cole, 1978]. Albian and Cenomanian strata of the Virginian Ridge Fonnation were derived from the west and deposited in fluvial, deltaic, and shallow-marine settings [Trexler, 1985].

The trail starts on glacial deposits, but a short distance to the east below the level of the trail Eagle Creek has cut down into the Twisp Valley Schist. Exposures are absent in the first stretch of trail which stays on the west side of Eagle Creek. Large boulders from northern "fmger" of the Paleocene Oval Peak pluton occur along the trail and are from outcrops on Snowshoe Ridge to the north. In the boulders note magmatic foliation defined by biotite books and rounded aggregates of weakly-strained quartz.

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