PRINCIPATO, Sarah M., Department of Geological Sciences, University of Colorado,
Campus Box 450, Boulder, CO 80309-0450, sarah@geology.wisc.edu; and MICKELSON, D.M., Department of Geology and Geophysics, University of Wisconsin-Madison, 1215 W. Dayton St, Madison, WI 53706.

Traditional mapping techniques combined with the use of ArcView 3.0 Geographic Information
System (GIS) were used to map northern Sheboygan and Manitowoc Counties in northeast
Wisconsin. Data were entered into the GIS at a topographic map scale of 1:24,000 and compiled
into 1:100,000 scale maps of surficial deposits after traditional air photo and surficial mapping.
Stratigraphy of the area was interpreted from drilling, domestic well logs, and exposures in gravel
pits and in the bluffs along Lake Michigan. Depth to bedrock is up to 100m, but outcrops occur
in a few places. A map of the bedrock surface was created using a Spatial Analyst nearest
neighbors interpolation.

The use of the GIS aids the mapping process in at least three ways. Firstly, it facilitates the
compilation of landforms, such as drumlins, moraines, and abandoned channels, in vector format.
Secondly, it provides a clear display of grain size data, so that maps partitioning areas containing
considerable sand, silt, or clay can be easily created. Thirdly, it permits the study to be integrated
into a geographically referenced project. The surficial deposits and depth to bedrock layers are
being used by county planners in order to locate future landfill sites, possible sources of
aggregate, and aid future groundwater studies. A next logical step is to employ digital
orthophotos combined with a raster data for topographic maps during compilation of field data
and sample collecting points.