Preliminary geologic map of the west half of the Vancouver (Wa.-Ore.) 1° x 2° quadrangle, Oregon

Wells, Ray E.; Niem, Alan R.; MacLeod, N.S.; Snavely, Parke Detweiler; Niem, Wendy A.

doi:10.3133/ofr83591

Cited by 10 publications

(18 citation statements)

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“…1) between about 60 and 30 Ma are summarized in the following sections. Barksdale (1975), Gard (1968), Heller and Dickinson (1985), Huntting et al (1961), Hyndrnan (1980), Tabor and Cady (1978a), Tabor et al (1968Tabor et al ( , 1980Tabor et al ( , 1982aTabor et al ( , 1982b, United States Geological Survey (1964,1966,1969), Walker (1977), Wells (1979Wells ( , 1981, Wells and Peck (1961), Wells et al (1983), and J . C. Yount (written communication, 1984).…”

Section: Introductionmentioning

confidence: 96%

“…For example, the upper part of the Crescent Formation in southwestern Washington is interbedded with the arkosic sandstone of Megler, and the younger Goble Volcanics to the east are interbedded with sandstones of the Cowlitz Formation (Wells 1979(Wells , 1981. In Oregon, the Yachats Basalt (Snavely and MacLeod 1974) and the Tillarnook Volcanics (Wells et al 1983) consist primarily of subaerial flows overlying a base of pillow basalts that apparently erupted in a forearc-basin setting. The exact origin of these forearc volcanic rocks and subsequent intrusive activity is uncertain.…”

Section: Introductionmentioning

confidence: 98%

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Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Heller¹,

Tabor²,

Suczek³

1987

Can. J. Earth Sci.

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Paleogeographic reconstructions for Oregon and Washington during Paleogene time illustrate a major transition from a dominantly compressional (prior to middle Eocene time) to an extensional tectonic regime. This transition resulted in the development of three phases of Paleogene basin evolution in the United States Pacific Northwest. During the initial phase, basins formed along the continental margin during collision of oceanic islands. Sediments in these basins were derived from nearby orogenic highlands. The second phase of basin development began in middle Eocene time and consisted of rapid subsidence of individual basins that formed within a broad forearc region. Nonmarine basins that formed during this phase were caused by extension possibly associated with transcurrent faulting. Rapid sedimentation in both marine and nonmarine basins during this time consisted dominantly of sandstone derived from Cretaceous plutonic sources far to the east. The final stage of basin development was the modification of previous basin configurations by the growth of the Cascade volcanic arc, which was initiated in early Oligocene time. The rising Cascade Range diverted streams canying eastem-derived material, thereby reducing overall sedimentation rates in the coastal basins and providing a local source of volcanic detritus.Dans les Ctats de l'Or6gon et de Washington, les reconstitutions palBogCographiques durant le PalCogbne illustrent une pCriode de transition majeure d'un regime de compression tectonique dominante (anterieur i 1'Eocbne moyen) B un rCgime de distension tectonique. Trois phases de 1'Cvolution du bassin palkogbne dans le nord-ouest Pacifique des Etats-Unis sont dues h cette transition. Au cours de la phase initiale, des bassins se formbrent le long de la marge continentale lors de la collision des iles ockaniques. Les saiments dans yes bassins provenaient des hautes terres des monts avoisinants. La seconde phase de dtveloppement du bassin dCbuta i 1'Eocttne moyen, et elle correspond B une subsidence rapide des bassins individuels qui s'ktaient formCs au coeur d'une grande region d'arc frontal. Les bassins continentaux qui se developpbrent durant cette phase doivent leur origine B une extension qui accompagnait probablement un dkcrochement. La sedimentation rapide dans les bassins marins et continentaux i cette Cpoque Ctait dominee par des g k s dCrivCs des &ions nourricsres plutoniques cr6tacCes situCes plus i l'est. L'Ctape final du dCveloppement des bassins fut la modification des configurations des bassins dCjB exitants provoquke par la croissance de l'arc volcanique des Cascades, lequel arc est apparu au dCbut de I'Oligocbne. Le soulbvement de la chaine des Cascades a modifiC la direction d'ecoulement des cours d'eau qui transportaient des matkriaux provenant de l'est, de ce fait rkduisant les taux de sedimentation moyens dans les bassins c6tiers et foumissant une source locale de detritus volcanique.[Traduit par la revue]Can.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Heller¹,

Tabor²,

Suczek³

1987

Can. J. Earth Sci.

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“…Eruption of silicic volcanics, including ash flows, tuffs, and lavas, was common throughout the study area during this period. Deposition of felsic siltstones and sandstones is also noted during this period (Wells et al, 1983;Orr and Orr, 1999). felsic siltstones and sandstones (Orr and Orr, 1999).…”

Section: 11: Geologic History Of Oregonmentioning

confidence: 75%

“…Includes Scappoose Formation (Trimble, 1963;Wells et al, 1983), mudstone of Oswald West (Niem and Van Atta ,1973;Wells et al, 1983), Pittsburg Bluff Formation , and Smuggler Cove and Northrup Creek formations (informal names) of Niem and Niem (1985).…”

Section: Tmst -Marine Sedimentary and Tuffaceous Rocks (Middle Miocenmentioning

confidence: 99%

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Arsenic in the Soils of Northwest Oregon

Ricker¹

2000

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One hundred and eighty-six soil samples from Northwest Oregon were tested for arsenic content. The highest values measured were 13.9 ppm in the A horizon (site C4) and 20.4 ppm in the B horizon (Site P4). Arsenic was not detected in 28 A horizon samples and 23 B horizon samples. Data are grouped based on the age and rock type of underlying bedrock. Lithologic groups with six or more data points were compared statistically to ascertain if groups are distinct. Analysis of Variance (ANOVA) multiple comparison tests indicate that the arsenic content of the Marine Sediments and Sedimentary Rocks group samples is distinguishable from the Quaternary Basalts group in the A horizon and all other groups in the B horizon. Kruskal-Wallis multiple comparison tests indicate that the arsenic content of the Marine Sediments and Sedimentary Rocks group is distinguishable from the Quaternary Basalts, Quaternary/ Tertiary Sediments and Sedimentary Rocks and Volcanic Sediments groups in both the A and B soil horizons. The ANOVA and Kruskal-Wallis tests compared A and B horizon data by lithologic group. The ANOVA shows the Marine Sediments and Sedimentary Rocks group in the A horizon is distinct from the Quaternary Basalts in the A and B horizon. The Kruskal-Wallis test yielded the same result. Per the ANOVA, the Marine Sediments and Sedimentary Rocks in the B horizon are distinct from all other tested groups. The Kruskal-Wallis test shows the Marine Sediments and Sedimentary Rocks group in the B ii horizon as distinct from the Quaternary Basalts, Quaternary/ Tertiary Sediments, and Volcanic Sediments groups in the A and B horizon. A K-means cluster analysis was used to group all available data independent of underlying bedrock. Three, four, and five group analyses were conducted, and the results of these tests were compared to the data grouped by underlying rock type. No correlation between the groups resulting from the K-means cluster analysis and groups based on underlying lithology was found. This analysis supports the creation of a map distinguishing arsenic content in the soils above Marine Sediments and Sedimentary Rocks group units from arsenic content in all other tested lithologic groups. The mean and standard deviations of these groups (in ppm) are: A horizon: Marine Sediments (6.09 ±2.66); other groups (3.10 ±3.19); B horizon: Marine Sediments (10.26 ±4.65); other groups (3.13, ±2.52). This analysis indicates that geologic context must be taken into account when determining background levels of naturally occurring arsenic in soils.

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Geochemistry and petrology of late Eocene Cascade Head and Yachats Basalt and alkalic intrusions of the central Oregon Coast Range, U.S.A.

Parker

Hodges

Perry

et al. 2010

Journal of Volcanology and Geothermal Research

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Preliminary geologic map of the west half of the Vancouver (Wa.-Ore.) 1° x 2° quadrangle, Oregon

Cited by 10 publications

References 0 publications

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Paleogeographic evolution of the United States Pacific Northwest during Paleogene time

Arsenic in the Soils of Northwest Oregon

Geochemistry and petrology of late Eocene Cascade Head and Yachats Basalt and alkalic intrusions of the central Oregon Coast Range, U.S.A.

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