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Tualatin River Watershed
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Geology
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Stratigraphy
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PDX Scholar
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1. [Article] Biostratigraphy of the Cowlitz Formation in the upper Nehalem River Basin, northwest Oregon
Examination of stream and roadcut exposures of the Cowlitz Formation allows the selection of measured representative sections, and collection of fossils, from an area roughly defined by the intersection ...Citation -
Approximately 150 meters (500 feet) of Grande Ronde Basalt and 140 meters (450 feet) of Wanapum Basalt of the Columbia River Basalt Group are exposed in the Bull Run Watershed. In Bull Run, the Grande ...
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