Note: To reduce load times on our web page, some map images may not reflect HGM high
standard of quality.
Example: Iliamna Quadrangle - Quad 103, nw corner
Example of geologic layer only:

Click on thumbnail to view Acrobat PDF file of:
Quad 103, nw corner - B&W - 316 kb. approx. 2.8 min. @28.8
Final geologic maps are registered to the topographic base maps which were produced
from the existing USGS topographic quadrangles 15 minute series, (1" = 1 mile
series). Map compilation scale 1:96,000 (1"=8,000').