deposited as the result of stream blockage which occurred as streams were Includes older alluvium and related deposits of Piper (1942), Willamette Silt (Allison, 1953; Wells and Peck, 1961), alluvial silt, sand, and gravel that form terrace deposits of Wells and others (1983), and Gresham and Estacada Formations of Trimble (1963). Includes deltaic gravel and sand and gravel bars, in pluvial lake basins in southeastern part of map area. Potassium-argon ages from this unit range from about 1.2 to 3.9 Ma; in places difficult to distinguish from youngest flows of unit Trb. Preliminary Geologic Map of the Buxton 7.5' Quadrangle, Washington County, Oregon By Philip A. Dinterman and Alison R. Duvall.

No. Basalt and associated sedimentary units, the western edge of the extensive The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000 or smaller. Click here for a printable version of this of North American near the present western Idaho border. (split with Tpb is at 5 Ma) (includes rocks shown as Some flows of this unit are lithologically similar to flow rocks of the High Cascade volcanic sequence and some are more like flows that in the past have been mapped as part of the Sardine Formation (Peck and others, 1964) and Elk Lake Formation of McBirney and others (1974) and Sutter (1978). metamorphosed sedimentary and volcanic rocks of the Jurassic Seven Devils Click here for a discussion of the geology

During the Jurassic, an oceanic trench formed off the western margin

Potassium-argon ages mostly about 15 Ma (Lux, 1982; Fiebelkorn and others, 1983), Unstratified mixtures of fragments of adjacent bedrock. Includes Bastendorff Formation of Baldwin (1974), Flows of dark-gray to black, aphyric tholeiitic basalt, including both high- and low-Mg chemical types (Swanson and others, 1979). Includes some rocks formerly mapped as Rhododendron Formation by Peck and others (1964), Thin flows and minor flow breccia of open--textured (diktytaxitic) olivine basalt in southeastern part of map area. Includes some dense, aphyric flows, commonly with either cryptocrystalline or pilotaxitic to trachytic texture, and porphyritic flows with phenocrysts and glomerocrysts of olivine, hypersthene, and labradorite. The Weiser River Valley contains Miocene sandstones deposited in rivers of North Dakota Volcano World website http://volcano.und.nodak.edu/vwdocs/volc_images/north_america/crb.html. Includes Touchet Beds of Flint (1938), deposits of valley terraces of Newcomb (1965), and, in southeast Oregon, basin-filling deposits that incorporate Mazama ash deposits (Qma, Qmp) in the youngest layers, Subaerial basalt and minor andesite lava flows and flow breccia; submarine palagonitic tuff and pillow complexes of the Columbia River Basalt Group (Swanson and others, 1979); locally includes invasive basalt flows. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey.

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