##### 

##### U.S. Geological Survey   Geologic Investigations Series Map I-2683

## Geologic Map of the Bend 30- X 60-Minute Quadrangle, Central Oregon

### *By* David R. Sherrod, Edward M. Taylor, Mark L. Ferns, William E. Scott, Richard M. Conrey, and Gary A. Smith

### 2004

*Aerial view, the Three Sisters volcanoes in Oregon, from the south looking north. Left to right -- South Sister, Middle Sister, and North Sister.  USGS Photograph taken in September 1985 by Lyn Topinka*

| This map presents the stratigraphic and structural setting of volcanic and sedimentary strata deposited during the past 35 million years across 4,430 km2 in central Oregon.  Snowfall in the Cascade Range (west part of map area) recharges important aquifers in the Deschutes basin (central part of map).  The area includes the majestic peaks of the Three Sisters volcanoes, where continued eruptions of basalt and rhyolite in the past 3,000 years indicate an ongoing volcanic hazard.  The Sisters fault zone, with several potentially active faults, traverses the map from southeast to northwest.

 

 
**File         Name******File         Type and Description****File         Size**FILES for VIEWING and PLOTTING******(Both tagged and untagged versions follow.)i2683_bend_pamphlet.pdfPDF file of the 49-page descriptive geologic pamphlet that accompanies the map448 KB Tagged versionfor accessibility using assistive technology such as screen readers664 KB i2683_bend_sheet1.pdfGeologic map and description of map units (PDF file of 52" x 42" map sheet that can be used for viewing map in a browser, as well as for plotting)23.2 MBi2683_bend_sheet2.pdfCorrelation of map units and cross sections (PDF file of 39" x 33" sheet)1.8 MB
**Also of Interest**

Koch, Richard D., Ramsey, David W., Sherrod, David R., Taylor, Edward M., Ferns, Mark L., Scott, William E., Conrey, Richard M., and Smith, Gary A., 2010, Database for the geologic map of the Bend 30- x 60-minute quadrangle, central Oregon:  U.S. Geological Survey Data Series 303 [https://pubs.usgs.gov/ds/303/].

Version history

For questions about the content of this report, contact Dave Sherrod

Download a current version of Acrobat   Reader for free

| Help   | PDF help   | Publications main page | Western reports  main page | | Western Geologic and Miscellaneous Investigation Series Maps || Privacy   Statement | Disclaimer   | Accessibility || Geologic   Division | Volcano Hazards Program   |

This map is also available from:

USGS Information Services, Box 25286Federal Center, Denver, CO 80225telephone: 1-888-ASK-USGS; e-mail: infoservices@usgs.gov
| Department of the Interior | U.S. Geological Survey |URL of this page: https://pubs.usgs.gov/imap/i2683/Maintained by: Michael Diggles Created:  March 17, 2005 Last modified: May 10, 2011 (mfd)******** |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|