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Using Maps & Atlases: Geologic Maps

This is a guide with information on maps and atlases at DePauw University Libraries.

Geologic maps

We maintain a small collection of USGS geologic maps in the Prevo Library Map Room.  Geologic maps use a combination of lines, symbols and colors to show the composition and structure of earth materials and their distribution across and beneath the Earth's surface.  Geologic maps are filed by lettered series.

 DePauw has mostly HA’s , I’s and MF’s.

    • Hydrologic Investigations Atlases (HA).  Show a wide range of water-resources information, such as depth to ground water, floods, and chemical content of water.

    • Miscellaneous Investigations (I).  Cover diverse topics such as bedrock and surface geology, marine geology, geochemistry, landforms, and map projections; includes maps of the moon and other planetary bodies.

  • Miscellaneous Field Studies Maps (MF).  Cover most aspects of the USGS. investigations and research, including environmental studies.


DePauw’s geologic maps are not in the library's online catalog at this time; to locate a specific map by topic or location, use:


Additional online indexes to USGS Maps include:

    • Geographic Names Information System (GNIS) - can be used to identify the name of the topographic map for an area by searching for the name of the place.  Enter the place name of interest in the Feature Name field and select the state with the pull-down menu.

  • GeoRef - Select Map as Publication Type.  Type in your search terms, for example hydrology and North Carolina.  Select the appropriate title and note the map series and text number in the report number field of the item record.