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  1. The structure and stratigraphy of the Columbia River basalt in the Chehalem Mountains, Oregon

    The Chehalem Mountains area, encompassing 70 square kilometers, is at the western extent of the Columbia River Basalt Group as mapped in western Oregon. The flows in the study area were identified as belonging...

  2. The stratigraphy and structure of the Columbia River basalt in the Clackamas River drainage

    The Clackamas River drainage within the western Cascade Range is approximately aligned with a northwest trending lineation defined by the Portland Hills and the Brothers Fault zone. This area is occupied by an...

  3. Granulometric analysis of recent sediments of Tillamook Bay, Oregon

    The author has sampled the recent bottom sediments in Tillamook Bay, Oregon. Sediment distribution is assessed in relation to sediment source areas and related to sedimentary environments. Particular attention...

  4. Development and application of some quantitative stratigraphic techniques to the Coos Bay coalfield, a Tertiary...

    A computer technique for interpreting geophysical logs of drill-holes in quantitative lithologic terms has been developed and tested on the deposits of the late Eocene Coaledo Formation, a well-studied...

  5. Rock slope stability studies in Siskiyou National Forest

    The line mapping method of Piteau and Martin (1977) was tested on two different rock type road cuts in the Siskiyou National Forest, and was found to be an efficient means of collecting geological data for rock...

  6. Stratigraphy, diagenesis, and depositional environment of the Cowlitz Formation (Eocene), northwest Oregon

    The Upper Eocene Cowlitz Formation is exposed in surface outcrops southwest of the town of Vernonia, in Columbia County, Oregon. The Cowlitz Formation also occurs in the subsurface of the Mist gas field where...

  7. The structural controls of the Vale Rhinehart Buttes complex, Vale KGRA, Malheur County, Oregon

    The Vale KGRA is characterized by high heat flow, two to five times higher than the worldwide average, and by numerous hot springs. The hot springs are aligned along faults. This phenomena is typical of a Basin...

  8. A stratigraphic-geochemical study of the Troutdale Formation and Sandy River Mudstone in the Portland basin and lower...

    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...

  9. Grounding-line basal melt rates determined using radar-derived internal stratigraphy

    We use ice-penetrating radar data across grounding lines of Siple Dome and Roosevelt Island, Antarctica, to measure the spatial pattern, magnitude and duration of sub-ice-shelf melting at these locations....

  10. Geometry of Silicic Dikes Beneath the Inyo Domes, California

    Structural geologic evidence in the vicinity of the Inyo Domes indicates that the youngest extrusive products were erupted from a silicic dike that divided into at least three segments which underwent up to...

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