The stratigraphy and structure of the Columbia River basalt group in the Bull Run watershed, Multnomah and Clackamas Counties, Oregon
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 Ronde Basalt is divided into three mappable units: "low Mg" R2 (at least one flow), "...
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| Format: | Others |
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PDXScholar
1981
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| Online Access: | https://pdxscholar.library.pdx.edu/open_access_etds/3267 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=4275&context=open_access_etds |