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Geology -- Oregon -- Clatsop County
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3. [Article] Plate1.pdf
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4. [Article] Plate3.pdf
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5. [Article] Plate4.pdf
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6. [Article] Plate2.pdf
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7. [Article] NelsonDavidEzra1985.pdf
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The middle Eocene Tillamook Volcanics form the oldest rock unit in the Elsie-lower Nehalem River area. K-Ar age determinations and age constraints imposed by foraminiferal and calcareous nannofossil assemblages ...
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The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks ...
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Six Tertiary units are exposed in the Onion Peak area near the town of Cannon Beach., Oregon. The units consist of: late Eocene to early Miocene Oswald West mudstones (informal), middle Miocene Astoria ...
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