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Tualatin River valley

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Journal Article
Published: 01 January 2000
Journal of Sedimentary Research (2000) 70 (1): 117–126.
... the Willamette River in the Portland Basin into the lower Tualatin River valley. Hillsboro Formation sands are texturally and compositionally immature ( Wilson 1997 ). The textural immaturity of the sands suggests that they accumulated in a lower-energy environment free from turbulent currents that could...
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Journal Article
Published: 01 April 2003
Environmental and Engineering Geoscience (2003) 9 (4): 327–338.
... connected by surface runoff. All runoff in the Tualatin Valley flows from the Tualatin River into the Willamette River of the Portland basin, which in turn empties into the Columbia River in the city of Portland. Elevations in the area range from approximately 3,000 ft (914 m) in the Oregon Coast Range...
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Journal Article
Journal: Geosphere
Published: 21 April 2021
Geosphere (2021) 17 (3): 804–823.
... the Columbia River ( Liberty, 2002 ). The base of CRBG is exposed along the margins of the Tualatin basin and around the Dutch Canyon anticline ( Fig. 6 ). As with the top CRBG horizon, surface geology was used to guide interpolation. Previously modeled gravity data were also used to interpret base CRBG...
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Journal Article
Published: 04 May 2021
Bulletin of the Seismological Society of America (2021) 111 (3): 1221–1233.
.... In contrast, seismic surveys within the Tualatin basin have yet to image the underlying crystalline basement ( Popowski, 1996 ; Wilson, 1998 ), due in part to the presence of a thick cap layer of basalt from the Columbia River Basalt Group (CRBG). Further, borehole measurements that intersect the basement...
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Journal Article
Journal: Geosphere
Published: 01 April 2014
Geosphere (2014) 10 (2): 264–275.
...)00028-7 . Schlicker H.G. Deacon R.J ., 1967 , Engineering geology of the Tualatin Valley region, Oregon : Oregon Department of Geology and Mineral Industries Bulletin 60 , 103 p. Simpson R.W. Cox A ., 1977 , Paleomagnetic evidence for tectonic rotation of the Oregon...
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Journal Article
Published: 01 August 2004
Bulletin of the Seismological Society of America (2004) 94 (4): 1402–1409.
...Richard J. Blakely; Marvin H. Beeson; Kenneth Cruikshank; Ray E. Wells; Ansel Johnson; Ken Walsh Abstract A high-resolution gravity survey through the Tualatin Mountains (Portland Hills) west of downtown Portland exhibits evidence of faults previously identified from surface geologic...
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Journal Article
Published: 01 January 1999
Environmental and Engineering Geoscience (1999) V (2): 189–197.
...DOYLE C. WILSON; SCOTT F. BURNS; WESLEY JARRELL; ALAN LESTER; EDWIN LARSON Abstract Orthophosphate concentrations in the Tualatin River of northwest Oregon have historically been high enough for the formation of seasonal algal blooms in the lower slow moving stretches of the river. Past work...
Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(31)
EISBN: 9780813756158
..., including high degree of confinement, low bulk permeability and limited recharge have led to overdraft conditions in many areas. Conversely, these characteristics create favorable conditions for aquifer storage and recovery system development in the central Willamette Valley and Tualatin Basin...
Journal Article
Published: 15 December 2020
Bulletin of the Seismological Society of America (2021) 111 (2): 671–685.
... on the Cascadia megathrust based on 3D simulations and stochastic synthetics, part 1: Methodology and overall results , Bull. Seismol. Soc. Am 108 , doi: 10.1785/0120180034 . Hart D. H. , and Newcomb R. C. 1965 . Geology and ground water of the Tualatin Valley Oregon , U.S. Geol. Surv. Water...
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Journal Article
Journal: Geosphere
Published: 06 February 2020
Geosphere (2020) 16 (2): 660–684.
... to just west of Timber, on the Nehalem River ( Figs. 4A and 4B ). Field work in the segment west of the Tualatin Basin shows the fault to consist of two strands, one in Gales Creek and another 7 km to the west in the valley of Parsons Creek ( Wells et al., 2018 , 2019 ). The two strands are quite linear...
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Image
Water flow relationships between the <b>Tualatin</b> and Willamette <b>rivers</b> during ...
Published: 01 January 2000
Figure 11 Water flow relationships between the Tualatin and Willamette rivers during Plio-Pleistocene time. A) The Tualatin River initially extended farther east into the Willamette Valley than it does today. B) Boring Lava flows dammed the Willamette River approximately 2.44 million years
Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(32)
EISBN: 9780813756158
... of the Grande Ronde, Wanapum, and Saddle Mountains Basalts all made it to the ocean; at least 33 flows are recognized in the western Columbia River Gorge, 50 in the Willamette Valley, 16 in the lower Columbia River Valley, and at least 12 on the Oregon side of the Astoria Basin. In the Astoria Basin, the basalt...
Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(28)
EISBN: 9780813756158
... ponded. The cataclysmic floods were also responsible for eroding deep channels and valleys (“coulees”) into the CRBG in the northern, central, and western portions of the Columbia Plateau, Columbia River Gorge, and northern Willamette Valley. A tremendous amount of data and information...
Journal Article
Journal: GSA Bulletin
Published: 01 August 2000
GSA Bulletin (2000) 112 (8): 1225–1233.
... of the National Seismic System, accessed 1999 ) Inset map—Regional location of the study area. White areas indicate elevations below 200 m. Rectangle indicates area of Figures 1 , 2 , and 3 . P—Portland basin; T—Tualatin basin; NW—northern Willamette Valley; SW—southern Willamette Valley; SHSZ—St. Helens...
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Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(33)
EISBN: 9780813756158
.... 25.3 Brays Landing Road. Ribbon Cliff on opposite side of river was source of landslide shaken down by the great 1872 earthquake, a slide said to have blocked the river for hours. 26.3 Daroga State Park (restrooms). 29.0 Across and slightly downriver is Entiat (town) at mouth of Entiat valley...
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Image
Figure 1. Generalized geology and faults of the northern Willamette <b>Valley</b>....
Published: 01 August 2000
) Inset map—Regional location of the study area. White areas indicate elevations below 200 m. Rectangle indicates area of Figures 1 , 2 , and 3 . P—Portland basin; T—Tualatin basin; NW—northern Willamette Valley; SW—southern Willamette Valley; SHSZ—St. Helens seismic zone ( Weaver and Smith, 1983
Journal Article
Published: 01 August 2001
Bulletin of the Seismological Society of America (2001) 91 (4): 637–650.
... a widespread erosional unconformity that is a useful marker horizon for examining late Pleistocene and Holocene tectonics. The late Pleistocene Columbia River valley is apparent as a paleochannel up to 85 m deep eroded into the unconformity near and beneath the modern Columbia River. Our profiles...
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Image
A)  Augite-hornblende-hypersthene (AHH) ternary plot of recent stream sedim...
Published: 01 January 2000
Figure 7 A) Augite-hornblende-hypersthene (AHH) ternary plot of recent stream sediments in the Tualatin Valley and the Columbia River. The Columbia River samples show an increasing abundance of hypersthene west of the Cascade Range. Hypersthene abundances for the Tualatin Valley streams (>
Journal Article
Journal: GSA Bulletin
Published: 01 August 2000
GSA Bulletin (2000) 112 (8): 1209–1224.
...) and study area indicating data sets used to identify late Miocene unconformity and determine stratigraphy of the fore-arc basin. Inset shows locations of relevant Ocean Drilling Program (ODP) and Deep Sea Drilling Project (DSDP) sites. WV—Willamette Valley, CR—Coast Range, ERB—Eel River basin, Washington...
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Journal Article
Published: 01 July 2014
Vadose Zone Journal (2014) 13 (7): vzj2014.01.0005.
...: The significant role of colloids . J. Environ. Monit. 13 : 2844 – 2850 . doi:10.1039/c1em10482a Mayer T.D. Jarrell W.M. . 1995 . Assessing colloidal forms of phosphorus and iron in the Tualatin River basin . J. Environ. Qual. 24 : 1117 – 1124 . doi:10.2134/jeq1995.00472425002400060010x...
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