| 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. |
| Genre: | Article |
| ProdID: | 70003358 |
| Citation Author: | Evarts, Russell C.; O'Connor, Jim E.; Wells, Ray E.; Madin, Ian P. |
| Citation Contributing Office: | Geology and Geophysics Science Center; Oregon Water Science Center |
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| Citation End Page: | 10 |
| Citation Issue: | 9 |
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| Citation Language: | English |
| Citation Larger Work Title: | GSA Today |
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| Citation Phsyical Description: | 7 p. |
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| Citation Publisher: | The Geological Society of America |
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| Citation Search Results Text: | The Portland Basin: A (big) river runs through it; 2009; Article; Journal; GSA Today; Evarts, Russell C.; O‘Connor, Jim E.; Wells, Ray E.; Madin, Ian P. |
| Citation Start Page: | 4 |
| Citation Volume: | 19 |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | The Portland Basin: A (big) river runs through it; 2009; Article; Journal; GSA Today; Evarts, Russell C.; O‘Connor, Jim E.; Wells, Ray E.; Madin, Ian P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://www.geosociety.org/gsatoday/archive/19/9/pdf/i1052-5173-19-9-4.pdf |
| Date Other: | Sun, 25 Dec 2011 15:02 -0600 |
| Publisher: | The Geological Society of America |
