This open-file report consists of two colored 35-mm photographic slides. Slide 1 is a photograph of a hand-colored copy of the geologic map of the Dillon 1' x 2' quadrangle. Scale of original 1:250,00. Slide 2 is a brief explanation of the map units shown on slide 1.
Additional publication details
USGS Numbered Series
Slides showing a preliminary geologic map of the Dillon 1 degree by 2 degrees Quadrangle, Montana and Idaho
U.S. Geological Survey
Report: 4 p.; 2 Plates: 11 x 7.85 inches and 8.50 x 9.05 inches; 2 .tif files