USGS/Cascades Volcano Observatory, Vancouver, Washington

REPORT:
Field Trip Guide to the Central Oregon High Cascades

-- Scott, William E., and Gardner, Cynthia A., 1990,
Field trip guide to the central Oregon High Cascades, Part 1: Mount Bachelor-South Sister area: Oregon Geology, September 1990, v.42, n.5: Part 2: Bend Area: Oregon Geology, September 1990, v.42, n.6

This field excursion to the central Oregon High Cascades highlights aspects of Quaternary volcanic and glacial history in the vicinity of Mount Bachelor (formerly Bachelor Butte) and South Sister. Part 2 (Bend Area) portion of the field excursion to the central Oregon High Cascades highlights aspects of the ash-flow tuffs in the Bend area. The guide contains brief descriptions of the stops, and some of the key features and interpretations of the stops are discussed further in the paper by Hill and Taylor at the end of the guide. -- Scott and Gardner, 1990

In HTML Format
- Regional Geologic Setting -- some embedded graphics, most missing however, no Road Log, for Road Log and more in-depth text see USGS Open-File Report 89-645, linked below
Similar Publication:
- Guidebook for Field Trip to the Mount Bachelor-South Sister-Bend Area, Central Oregon High Cascades -- Scott, Gardner, and Sarna-Wojcicki (eds.), 1989, USGS Open-File Report 89-645, 66p.
Select Maps and Graphics
- Map [21K,InlineGIF] -- Geologic setting of the Three-Sisters-Mount Bachelor area
  Within the upper Miocene to Holocene High Cascades (stippled border). The Western Cascades are composed of upper Eocene to middle Miocene volcanic and volcaniclastic rocks. The parts of the Columbia Plateau and Basin and Range physiographic provinces shown on the map are composed dominantly of Tertiary volcanic and sedimentary rocks; Quaternary volcanic rocks cover most of the area near Newberry volcano. ... Figure compiled from Hammond (1979), Priest and others (1983), and Sherrod (1986).
  -- Modified for web, Lyn Topinka, 1997
- Map [21K,InlineGIF] -- Quaternary-age Vents in the Three Sisters Area
  Compilation of vents of Quaternary age and faults in the Three Sisters area (Scott, 1987). Triangles are stratovolcanoes; circles are vents of mafic (basalt and basaltic andesite), mostly monogenetic volcanoes; squares are vents of silicic (dacite and rhyolite) lava domes and flows. Numerous silicic vents on the flanks of south and Middle Sister are not shown. Solid symbols represent vents of latest Quaternary (>15,000 years) age; open symbols are vents of pre-latest Quaternary age. ... Heavy lines are faults; bar and ball on downthrown side. Crossed lines are fissures.
  -- Modified for web, Lyn Topinka, 1997
Other Menus of Interest
- Oregon High Cascades Menu -- CVO Menu
- Mount Bachelor Menu -- CVO Menu
- Three Sisters Menu -- CVO Menu

URL for CVO HomePage is: <http://vulcan.wr.usgs.gov/home.html>
URL for this page is: <http://vulcan.wr.usgs.gov/Volcanoes/Oregon/HighCascades/Publications/FieldTripGuide/framework.html>
If you have questions or comments please contact: <GS-CVO-WEB@usgs.gov>
02/03/06, Lyn Topinka

REPORT: Field Trip Guide to the Central Oregon High Cascades

REPORT:
Field Trip Guide to the Central Oregon High Cascades