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Open-File Report 99-141

Geologic Map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 Minute Quadrangles, Northwest Oregon: A Digital Database

By Terry Tolan and Marvin Beeson

Digital Database by Karen L. Wheeler

Thumbnail of and link to report PDF (10.4 MB)Summary

The Scotts Mills, Silverton, and Stayton NE 7.5 minute quadrangles are situated along the eastern margin of the Willamette Valley and adjacent lower foothills (Waldo and Silverton Hills) of the Cascade Range (Fig. 1). The terrain within this area is of low to moderate relief, ranging from 100 to more than 1000 ft above sea level. This area is largely rural, with most of the valley floor and low-relief foothills under cultivation. In the last decade, the rural areas outside the boundaries of established towns have experienced significant growth in new homes built and the expansion of housing subdivisions. This growth has placed an increased demand on existing geologic resources (e.g., groundwater, sand and gravel, crushed stone) and the need to better understand potential geologic hazards within this region.

Previous geologic mapping by Piper (1942), Peck and others (1964), Newton (1969), Hampton (1972), Miller and Orr (1984), Orr and Miller (1984), and Miller and Orr (1986, 1988) established and refined the general stratigraphic framework of this region. This mapping identified few faults or folds; earlier investigators were hindered by the lack of reliably identifiable marker horizons within the stratigraphic section. Werner (1991), using available seismic profile lines and well data in the Willamette Valley to locate the top of the Columbia River Basalt Group, was able to identify and map faults within the subsurface. Reconnaissance mapping of the Columbia River Basalt Group (CRBG) units in this region in the early 1980’s indicated that these stratigraphic units could serve as a series of unique reference horizons for identifying post-Miocene folding and faulting (Beeson and others, 1985, 1989; Beeson and Tolan, 1990).

The major emphasis of this investigation was to identify and map CRBG units within the Scotts Mills, Silverton, and Stayton NE quadrangles and to utilize this detailed CRBG stratigraphy to identify and characterize structural features.

Updated December 16, 2005

Data

  • Data package TAR.GZ (10 MB)
    Digital databases are available for GIS users in ARC/INFO export format format. Those who download digital data should also download the descriptive pamphlet.

Plot Files

  • All files PS (80.8 MB)
    Plot files are available for those who wish to produce paper copies of maps prepared from the digital data. Note that these plot files are formatted to plot on 42 by 34 inch (Sheet 1, rotated to fit 36 inch wide paper) and 35 by 32 inches (Sheet 2) sheets.
  • All files PDF (33.3 MB)
    Plot files are available for those who wish to produce paper copies of maps prepared from the digital data. Note that these plot files are formatted to plot on 42 by 34 inch (Sheet 1, rotated to fit 36 inch wide paper) and 35 by 32 inches (Sheet 2) sheets.

The National Geologic Map Database has additional data about this publication

For additional information, contact:
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
345 Middlefield Road, MS 901
Menlo Park, CA 94025-3591
http://geomaps.wr.usgs.gov/gmeg/

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Suggested citation:

Tolan, Terry, Beeson, Marvin, Wheeler, K. L., 1999, Geologic Map of the Scotts Mills, Silverton, and Stayton Northeast 7.5 Minute Quadrangles, Northwest Oregon: A Digital Database: U. S. Geological Survey Open-File Report 99-141, 11 pp., https://pubs.usgs.gov/of/1999/0141/.


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