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Abstract
Metropolitan Portland, Oregon, USA, lies within a small Neogene to Holocene basin in the forearc of the Cascadia subduction system. Although the basin owes its existence and structural development to its convergent-margin tectonic setting, the stratigraphic architecture of basin-fill deposits chiefly reflects its physiographic position along the lower reaches of the continental-scale Columbia River system. As a result of this globally unique setting, the basin preserves a complex record of aggradation and incision in response to distant as well as local tectonic, volcanic, and climatic events. Voluminous flood basalts, continental and locally derived sediment and volcanic debris, and catastrophic flood deposits all accumulated in an area influenced by contemporaneous tectonic deformation and variations in regional and local base level.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The Portland Basin: A (big) river runs through it |
| Series title | GSA Today |
| Volume | 19 |
| Issue | 9 |
| Year Published | 2009 |
| Language | English |
| Publisher | The Geological Society of America |
| Publisher location | Boulder, CO |
| Contributing office(s) | Geology and Geophysics Science Center, Oregon Water Science Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | GSA Today |
| First page | 4 |
| Last page | 10 |
| Country | United States |
| State | Oregon |
| City | Portland |
| Google Analytic Metrics | Metrics page |