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Hillsboro Formation

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Journal Article
Published: 01 January 2000
Journal of Sedimentary Research (2000) 70 (1): 117–126.
... basins. The northwest-trending Tualatin Mountains-Portland Hills (TMPH) faulted anticline presently separates fine-grained sediments of the Hillsboro Formation in the Tualatin Basin from coarse-grained sediments of the Troutdale Formation in the Portland Basin. Augite-hornblende-hypersthene relative...
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Journal Article
Published: 01 January 1999
Environmental and Engineering Geoscience (1999) V (2): 189–197.
... to decrease phosphate levels concentrated on limiting agricultural runoff and reducing effluent from water treatment plants, yet phosphate levels have remained high. Close examination of the Willamette Silt and underlying Hillsboro Formation in the Tualatin Valley has revealed that phosphate is leaching from...
Journal Article
Published: 01 April 2003
Environmental and Engineering Geoscience (2003) 9 (4): 327–338.
...DOYLE C. WILSON Abstract Hydrogeologic properties of the Neogene Hillsboro Formation and Willamette Silt in the Tualatin basin are evaluated to provide a foundation for future groundwater use in the Portland, Oregon, metropolitan area, and are then compared to hydrogeological conditions...
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Figure 3. Isopach map of the <b>Hillsboro</b> <b>Formation</b>. The Portland Hills fault ...
Published: 01 April 2003
Figure 3. Isopach map of the Hillsboro Formation. The Portland Hills fault zone is buried under Missoula Flood deposits at the western margin of the Portland basin ( Madin, 1990 ). Cooper and Bull mountains are Columbia River Basalt Group exposures uplifted during the Pleistocene (after Wilson
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Figure 4. Potentiometric surface map of the collective <b>Hillsboro</b> <b>Formation</b> ...
Published: 01 April 2003
Figure 4. Potentiometric surface map of the collective Hillsboro Formation aquifers (in feet above mean sea level) using approximately 1,000 initial static water levels from water well drillers' log reports
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A)  AHH ternary plot of sands in the HBD-1 core. <b>Hillsboro</b> <b>Formation</b> sands ...
Published: 01 January 2000
Figure 8 A) AHH ternary plot of sands in the HBD-1 core. Hillsboro Formation sands have relatively little hypersthene (< 10%). Numbers are depths of samples in meters below surface. B) AHH ternary plot for sands from water wells and core samples in the Tualatin Valley. Hillsboro Formation
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t tests of AHH log ratios comparing the <b>Hillsboro</b> and Troutdale <b>formations</b> ...
Published: 01 January 2000
Table 2 t tests of AHH log ratios comparing the Hillsboro and Troutdale formations and the Willamette Silt. All tested at 0.01 level of significance.
Series: GSA Special Papers
Published: 01 July 2008
DOI: 10.1130/2008.442(05)
... Sonora. The brachiopods of these three faunas, as well as the gastropod Orecopia , are easily recognized in outcrop and thus are useful for local and regional correlations. Pragian brachiopods dominated by Acrospirifer and Meristella in the “San Miguel Formation” at Rancho Placeritos represent...
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Journal Article
Published: 01 February 1961
American Mineralogist (1961) 46 (1-2): 52–66.
...E-An Zen Abstract The mineral assemblages from seven pyrophyllite deposits in the Volcanic Slate belt of the North Carolina Piedmont were studied by x-ray and microscopic methods. These deposits are at Glendon, Robbins, Staley, Snow Camp, Hillsboro, Hager's Mountain, and Bowlingling's Mountain. Six...
Journal Article
Journal: Geosphere
Published: 01 December 2011
Geosphere (2011) 7 (6): 1357–1368.
... as Holocene by Davis (1983) , and the fault separates these Holocene deposits from late Pleistocene Sehoo Formation in the south and from pre-Lahontan sediments toward the northeast. The elevation of the Rye Patch fault as it cuts the small alluvial fan and Lake Lahontan shorelines is 1290 m ( Fig. 5...
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Series: AAPG Memoir, AAPG Memoir
Published: 01 January 2013
DOI: 10.1306/13391702M1023582
EISBN: 9781629812700
... individual tile. The stitched image is a 3.8-gigabyte TIFF (tagged image file format) file. Two mineral maps were obtained, with respectively 2.5-and 0.5-μm pixel spacing for the ED × measurements (Figures 11 , 12). The 2.5-μm spacing results were obtained on the full surface (16 mm wide). In total...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2431(08)
... the intensely deformed rocks correlative to the parautochthonous Yukon-Tanana terrane. The Upper Triassic rocks are unconformably overlain by Upper Cretaceous and lower Tertiary nonmarine sedimentary and volcanic rocks of the Cantwell Formation ( Sherwood, 1979 ; Ridgway et al., 1997 ; Cole et al., 1999...
Journal Article
Journal: GSA Bulletin
Published: 01 March 2015
GSA Bulletin (2015) 127 (3-4): 608–620.
... correlations of younger strandlines around the Pembina delta, accepted for more than a century, are incorrect; the Gladstone, Ojata, and Emerado strandlines south of the delta are offset by 10 m from their namesakes to the north and so are equivalent to the Ojata, Emerado, and Hillsboro strandlines...
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Journal Article
Published: 01 February 2018
Clays and Clay Minerals (2018) 66 (1): 1–8.
...Kiho Yang; Hanbeom Park; Hionsuck Baik; Toshihiro Kogure; Jinwook Kim Abstract —Alteration of basalt is a ubiquitous process on the vast oceanic crust surface and results in the formation of secondary-phase minerals that include clay minerals and Fe-(oxyhydr)oxides. Thus, this process...
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Journal Article
Published: 01 December 2013
Clays and Clay Minerals (2013) 61 (5): 416–423.
... be obtained. In the present study, hydrazine hydrate is proposed as an intermediate in the formation of hydrated kaolinite, with a short reaction duration. Stable hydrated kaolinite with d 001 = 0.84 nm was synthesized successfully and effectively with a short reaction time. The degree of intercalation...
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Journal Article
Published: 14 September 2016
Canadian Journal of Earth Sciences (2017) 54 (2): 134–140.
...Darla K. Zelenitsky; François Therrien; Kohei Tanaka; Philip J. Currie; Christopher L. DeBuhr Abstract The Willow Creek Formation (upper Maastrichtian – lower Paleocene) of southwestern Alberta is a poorly fossiliferous formation that preserves a low end-Cretaceous dinosaur diversity compared...
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Table 3.  Porosity, air permeability measurements, and calculated hydraulic...
Published: 01 April 2003
Table 3. Porosity, air permeability measurements, and calculated hydraulic conductivities from cores of the Willamette Silt (WS) and Hillsboro Formation sands
Journal Article
Published: 01 March 2013
Journal of Paleontology (2013) 87 (2): 312–340.
...Elizabeth C. Rhenberg; Thomas W. Kammer A bstract The Nunn Member (early Osagean) of the Lake Valley Formation of New Mexico is known for its abundance and diversity of crinoids. Although crinoids were first reported in the late 1800s, no comprehensive study of the crinoids has been conducted...
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Journal Article
Published: 01 January 2011
Reviews in Mineralogy and Geochemistry (2011) 73 (1): 513–578.
..., and the PGE. Allowing for some variability within any given ore deposit type, each of these types is unique in terms of the range of pressure and temperature of ore deposit formation, tectonic setting, and the compositional type(s) of parental causative magma. However, most porphyry-type ore deposits, layered...
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Statistical values and t tests for elements analyzed from silt and clay sed...
Published: 01 January 2000
Appendix A Statistical values and t tests for elements analyzed from silt and clay sediments in the Hillsboro Formation (HBD-1) and the Troutdale Formation (MTD-1).