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Background |
 | | The Tualatin Basin is bounded to the north, south and east by Columbia River basalt, flood basalts erupted in the Miocene and uplifted, and to the west by the Coast Range, consisting largely of marine sediments and volcanics (Schlicker and Deacon, 1967). |
 | | The Luckiamute Basin is bounded to the north, south, and east by uplifted Columbia River basalt, and to the west by the Coast Range, which consists largely of marine sediments and volcanics. |
 | | The Johnson Creek watershed is bounded by the Boring Hills to the south and east, terraces of the Columbia River to north and the Willamette River to the west (Hogenson and Foxworthy, 1965). |
| nwdata.geol.pdx.edu /Thesis/FullText/1999/Clark/background.html (2609 words) |
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