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  1. Subsurface biostratigraphy of the east Nehalem Basin, Columbia County, Oregon

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    This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.

  2. The stratigraphy of the Scappoose formation, the Astoria formation, and the Columbia River basalt group in northwestern...

    The study area is located in northwestern Columbia County, and covers an area of approximately 70 square kilometers. The purpose of the study was to investigate the possible correlation of the Scappoose and...

  3. Stratigraphy, lithofacies, and environment of deposition of the Scappoose formation in central Columbia County, Oregon

    The study area is located in central Columbia County and encompasses approximately 373 square kilometers. The purpose of the study was to map lithofacies to a scale of 1:31250, study the petrography of the...

  4. Stratigraphy, lithofacies and depositional environment of the Cowlitz Formation, T. 4 and 5N., R. 5W. Northwest Oregon

    The Cowlitz Formation in southern Columbia and Clatsop counties, northwest Oregon was studied in order to prepare a geologic map of parts of this formation and to determine the character of its lithofacies and...

  5. Preliminary geologic map of the Dixie Mountain 7.5' quadrangle, Columbia, Multnomah, and Washington counties, Oregon

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    The purpose of this project is to improve geologic mapping in the Portland urban area in order to better understand earthquake hazards. This coverage represent the most up-to-date, digital geology coverage...

  6. A geophysical study of the North Scappoose Creek, Alder Creek, Clatskanie River lineament, along the trend of the Portland...

    The Portland Hills fault forms a strong northwest trending lineament along the east side of the Tualatin Mountains. An en echelon lineament follows North Scappoose Creek, Alder Creek, and the Clatskanie River...

  7. Geology of the St. Helens quadrangles, Oregon

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    This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.

  8. 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...

  9. Onshore-offshore geologic cross-section from the Mist gas field, northern Oregon coast range, to the northern Oregon...

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    This archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.

  10. Geochemical Evolution of Ferruginous Bauxite Deposits in Northwestern Oregon and Southwestern Washington

    Ferruginous bauxite deposits developed from flows of the Columbia River Basalt Group in northwestern Oregon and southwestern Washington. Samples of the iron pisolite and the gibbsite nodular zones from the...

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