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Coast, Ocean, and Marine

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  1. Stratigraphy and sedimentation of the Onion Peak area, Clatsop County, Oregon

    Six Tertiary units are exposed in the Onion Peak area near the town of Cannon Beach., Oregon. The units consist of: late Eocene to

  2. Geology of the Saddle and Humbug Mountain area, Clatsop County, northwestern Oregon

    Six early to middle Tertiary geologic units crop out in the

  3. Geology of the Green Mountain-Young's River area, Clatsop County, northwest Oregon

    The upper Eocene to lower Oligocene Oswald West mudstone is

  4. Geology of the Seaside-Young's River Falls area, Clatsop County, Oregon

    Eight Tertiary geologic units crop out in the Seaside-Young's River Falls area, including late Oligocene to early Miocene Oswald West mudstones; Angora Peak sandstone and Silver Point members of the middle...

  5. Geology of the Hamlet-North Fork of the Nehalem River area, southern Clatsop and northernmost Tillamook Counties, northwest...

    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 were...

  6. Geology of the Rock Creek-Green Mountain area, southeast Clatsop and northernmost Tillamook counties, northwest Oregon

    The middle to upper Eocene Tillamook Volcanics form the volcanic core or basement rocks in the Rock Creek-Green Mountain area. They consist of a thick sequence of high TiO2 tholeiitic basalt, basaltic andesite,...

  7. Geology of the Elsie-lower Nehalem River area, south-central Clatsop and northern Tillamook counties, northwestern Oregon

    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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