First Advisor

Marvin H. Beeson

Date of Publication


Document Type


Degree Name

Master of Science (M.S.) in Geology






Geology -- Oregon -- Troutdale Formation, Geology -- Oregon -- Sandy River Mudston, Stratigraphic geology, Geochemistry -- Oregon -- Troutdale Formation, Geochemistry -- Oregon -- Sandy River Mudstone



Physical Description

1 online resource (115 p.)


Hyaloclastic sediment forms an identifiable stratigraphic interval within the Troutdale Formation that can be traced from the Bridal Veil channel to the Portland basin. Hyaloclastic sediment composed chiefly vitric sands is found interbedded with muds, sandy muds and gravels penetrated by wells in northeast Portland are correlated with the upper member of the Troutdale Formation. These beds are characteristic of the informal upper member of the Troutdale Formation in the Bridal Veil channel of the ancestral Columbia River (Tolan and Beeson, 1984) and the type area of the Troutdale Formation exposed along the Sandy River (Trimble, 1963). Fluvially deposited hyaloclastic beds within the upper Troutdale Formation are interpreted to be the result of interaction of Cascadian basaltic lavas with an ancestral Columbia River (Tolan and Beeson, 1984; Trimble, 1963). Glass clasts taken from well and outcrop samples have nearly identical trace and minor element geochemical content as determined by instrumental neutron activation analysis.


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Persistent Identifier

swanson_plate1.jpg (4204 kB)
Sampled Stratigraphic Sections

swanson_plate2.jpg (4322 kB)
High Cascade Lava Geochemical Sample Location Map