By Donald A. Swanson, Joseph A. Vance, Geoffrey A. Clayton, Russell C. Evarts(auth.)
About The Product
Published through the yank Geophysical Union as a part of the Field journey Guidebooks Series.
This guidebook is for a six-day day trip among Issaquah, Washington (east of Seattle), and Portland, Oregon, that emphasizes the Tertiary and Quaternary volcanic geology of the western Columbia Plateau and the Cascade variety of southern Washington and northern Oregon (Figures 1 and 2). The guidebook summarizes the geology of chosen components alongside the path and offers a short advent to the overall volcanic heritage of the Columbia River Basalt staff and the southern Washington Cascades. an in depth yet no longer exhaustive bibliography accompanies the guidebook. the line logs are designed to be self-guiding; as such, they're extra entire than helpful for guided bus tours.
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Extra resources for Cenozoic Volcanism in the Cascade Range and Columbia Plateau, Southern Washington and Northernmost Oregon
This age is consistent with assignment to the lower part of the Ohanapecosh [Vance et aL, 1987]. Several roadcuts from here to Packwood expose ash-flow tuff and volcaniclastic rocks of t h e Ohanapecosh. 9 Quarry to right in volcanic siltstone under sill. 2 Forest Service station on left in Packwood, oppo site junction with Forest Road 52. E n d of log. 0 Leave Forest Service station in Packwood. 0 Hills to left and ahead have not yet been mapped in detail. Reconnaissance suggests a middle Tertiary terrane intruded by dikes and sills.
0 3 4 7 3 U p creek to right is relatively fresh hornblende andesite dike cutting hornfelsed dacite breccia. 7 M a [Evarts et aL, 1987]. 4 Diorite in roadcut. 9 STOP 28. Trail to Independence Pass. Hike 200 m to small bench o n crest of low hill. T h e blast de posit is easily recognized by its gray color, poor sorting, and content of shredded wood. D. caused by fall of t h e dacitic T tephra in 1800. From the bench are good views of Spirit Lake, tree blowdown, and the northwest corner of t h e dacite dome in t h e crater.
9 STOP 16. Margin of Westfall Rocks microdiorite unit, with dark hornfelsed Wildcat Creek lapilli tuff hanging on margin (Figure 30). This intrusion, as well as Goose Egg Mountain and two other dikelike bodies of similar lithology, Kloochman Rock and Chimney Peaks, are of mid-Tertiary age but have not been dated. Whether they are feeders for andesite in the Fifes Peak Formation is problematic. T h e Westfall Rocks and Goose Egg intrusions are probably connected at depth but have joint patterns that suggest they are separate bodies at the present level of exposure.