This report, USGS SIM 3186, consists of the geologic map database (GIS database in ESRI file geodatabase and grid formats) to accompany the printed version of the "Geologic Map of Three Sisters Volcanic Cluster, Cascade Range, Oregon", U.S. Geological Survey Scientific Investigations Map 3186. Printable files for the geologic map can be downloaded below or from the SIM 3186 website.

Downloadable map files:

A PDF version of Sheet 1 (Geologic map and accompanying photographs)

A PDF version of Sheet 2 (Correlation and list of map units)

A PDF version of the accompanying pamphlet

Printed copies of the map (SIM 3186) and the accompanying pamphlet, including this CD-ROM, are also available from: