Skip Links

USGS HomeContact USGSSearch USGS

Open-File Report 99-141

Pubs Warehouse

# 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

| 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
-  **Readme** HTML
- **Readme** TXT (3.8 kB)
- **Readme** PDF (7.1 kB)  
- **Report** HTML

**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. 
-  **Map file** PDF (14.3 MB)  Scotts Mills and Silverton, OR geology map (sheet 1) 
-  **Map file** PDF (14.3 MB)  Stayton NE, OR geology map (sheet 2) 

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 94025-3591http://geomaps.wr.usgs.gov/gmeg/

Part or all of this report is presented in Portable Document Format (PDF). For best results viewing and printing PDF documents, it is recommended that you download the documents to your computer and open them with Adobe Reader. PDF documents opened from your browser may not display or print as intended. Download the latest version of Adobe Reader, free of charge. |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

### 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/*.

----

AccessibilityFOIAPrivacyPolicies and Notices

U.S. Department of the Interior |            U.S. Geological Survey           	URL: *http://pubsdata.usgs.gov/pubs/of/1999/0141/index.html*            Page Contact Information: GS Pubs Web Contact           	Page Last Modified: Wednesday, 07-Dec-2016 17:50:22 EST