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Molalla Oregon

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Journal Article
Journal: Geology
Published: 01 May 1997
Geology (1997) 25 (5): 403-406.
..., Washington), 350 km (Molalla, Oregon), and 370 km (Portland, Oregon). Ginkgo basalt was also sampled at its distal end at Yaquina Head, Oregon (500 km). Comparison of the glass MgO content, K 2 O in plagioclase, and measured crystallinities in the experimental charges and natural samples tightly constrains...
Journal Article
Journal: GSA Bulletin
Published: 01 August 2000
GSA Bulletin (2000) 112 (8): 1225-1233.
... on contractional structures, like the east-striking Seattle fault ( Pratt et al., 1997 ). The Mount Angel–Gales Creek, Canby-Molalla, Portland Hills–Clackamas River, and Sandy River–Frontal fault zones are at the northern end of the Oregon block and apparently participate in accommodating differential strain...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2014
GSA Bulletin (2014) 126 (3-4): 377-397.
...Jim E. O’Connor; Joseph F. Mangano; Scott W. Anderson; J. Rose Wallick; Krista L. Jones; Mackenzie K. Keith Abstract The rivers of western Oregon have diverse forms and characteristics, with channel substrates ranging from continuous alluvial gravel to bare bedrock. Analysis of several measurable...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2004
GSA Bulletin (2004) 116 (7-8): 817-839.
...Gregory J. Retallack; William N. Orr; Donald R. Prothero; Robert A. Duncan; Paul R. Kester; Clifford P. Ambers Abstract Thick ash-flow tuffs provide marker beds through fossiliferous Eocene and Oligocene marine and non-marine sedimentary rocks near Eugene, Oregon. New mapping, radiometric dating...
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Series: GSA Field Guide
Published: 01 January 2009
DOI: 10.1130/2009.fld015(31)
EISBN: 9780813756158
... This field trip guide has been prepared for a two-day hydro-geologic field trip in the northern Willamette Valley, in the vicinity of Portland, Oregon. Our main focus on this trip will be on the geology and hydrogeology of the middle Miocene flood-basalt flows...
Journal Article
Published: 01 December 1999
Bulletin of the Seismological Society of America (1999) 89 (6): 1473-1483.
... of Oregon and Washington , J. Geophys. Res. 87 , 10827 - 10837 . Hampton E. R. (1972) . Geology and ground water of the Molalla-Salem slope area, northern Willamette Valley, Oregon , U.S. Geol. Surv. Water-Supply Pap. 1997 , 83 pp. Hunter J. A. Pullan S. E...
Journal Article
Published: 01 August 1996
Bulletin of the Seismological Society of America (1996) 86 (4): 925-935.
.... Weaver C. S. Zollweg J. E. (1984) . The 14 February 1981 Elk Lake, Washington, earthquake sequence , Bull. Seism. Soc. Am. 74 , 1289 - 1309 . Hampton E. R. (1972) . Geology and ground water of the Molalla-Salem slope area, northern Willamette Valley, Oregon , U.S...
Journal Article
Journal: Geosphere
Published: 01 April 2014
Geosphere (2014) 10 (2): 264-275.
... of basement magnetic anomalies along strike to the southeast, along the Canby-Molalla fault, was interpreted ( Blakely et al., 2000 ). Although focal mechanisms in northwest Oregon are, in general, based on small earthquakes and show a combination of strike-slip and thrust faulting ( McCaffrey et al., 2007...
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Journal Article
Journal: Geosphere
Published: 01 December 2014
Geosphere (2014) 10 (6): 1283-1314.
...Robert J. Fleck; Jonathan T. Hagstrum; Andrew T. Calvert; Russell C. Evarts; Richard M. Conrey Abstract The 40 Ar/ 39 Ar investigations of a large suite of fine-grained basaltic rocks of the Boring volcanic field (BVF), Oregon and Washington (USA), yielded two primary results. (1) Using age control...
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Image
Figure 8. Sedimentological and paleomagnetic observations of Eugene Formati...
Published: 01 July 2004
Figure 8. Sedimentological and paleomagnetic observations of Eugene Formation near Brownsville and Salem and Scotts Mills Formation near Molalla, Oregon. Meter levels at Brownsville are interpolated from nearby composite stratigraphic sections of Figure 2 , but Salem and Scotts Mills sections