By Paul E. Hammond
About The Product
Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
The assembly of the Twenty-eighth overseas Geological Congress, in the course of July 1989 in Washington, D.C. with box journeys during the usa, presents a chance to organize a common consultant to the geology of the Cascade variety.
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Extra info for Guide to Geology of the Cascade Range: Portland, Oregon to Seattle, Washington
4). Their lengths ranged from 15 to 70 km from the crest -of the range, and they reached elevations as low as 130 m and 500 m on the western and eastern sides respectively. Maximum ice thicknesses in the valleys were 335 to 610 m. Evidences of glaciation. Evidences of glaciation are based on: (a) topography--relatively flat valley floor with U-shaped valley sides, rounded bedrock forms denuded of soil within the valley, local pitted or hummocky valley floor (ground moraine), narrow high-level terraces or lateral moraines along the valley margin and locally extending into tributary valleys, ridges or hills which form terminal moraines extending across valleys except where breached by the master stream, and outwash terraces grading downvalley from these hills.
The deeply sculptured ridges and core expose the structure of the volcano which is believed to be typical of other composite cones in tpe range (Sherrod, 1986). The central core or plug is 500 m wide and surrounded by altered eruptive breccia and scoria. The breccia and scoria extend outwards and grade through a narrow transition zone into thin lava flows which cap the radiating skeletal ridges. Mount Thie1sen is estimated to have formed between 730 and 250 Ka (Sherrod, 1986). Sand Hountain chain.
Selected Volcanic Centers, Fields, and Formations Several eruptive centers, volcanic fields, and formations, some of which are to be seen on the field trip, are briefly summarized below in alphabetical order. Identifying symbols appear on the field trip maps (Figs. 29-40). Lithologic characteristics of lava flows are summarized in Table 12. Chemical analyses of lava flows from some centers and volcanic fields are listed in Tables 13 and 14 and plotted in Figure 10. Battle Ax volcano. Battle Ax, 1,694 m, is a deeply eroded shield volcano, more than 490 m in height, composed chiefly of mafic andesite, with lesser amounts of basalt and hornblende andesite, and a small amount of hornblende dacite (White, 1980a).