Great Lakes Glacial Surveys

Laura Sherrod - 2012

Three dimensional imaging of glacial deposits has become a very important way to expand our understanding of the geologic history of locations such as Michigan and New York.  Through the use of methods such as Ground Penetrating Radar and Resistivity, images of the subsurface can be produced to show the three dimensional nature of glacial structures and thus make detailed interpretations of the processes at work during previous glacial advances and retreats.  Dr. Laura Sherrod joined Dr. William Blewett and Dr. Scott Drzyzga of Shippensburg University  in the summer of 2012.   


Sandy soils in this region are ideal for GPR surveys. 

The 200MHz antenna was used to identify subsurface glacial structures.

Three field sites were visited during the summer field work.  The first site was a possible delta.  The intent of surveying this location was to identify topset and foreset features in the subsurface to confirm the delta interpretation at this location.  Field site number two was an interpreted convergence between two outwash plains.  This location had numerous kettle depressions.  The final field site was on another deltaic surface.  Again topset and foreset beds were the target, with the intent of locating truncation of those beds from erosional surfaces. 

The GPR survey lines followed dirt roads in the Great Lakes region.  Intermittent GPS readings were taken throughout the survey to provide a map of the location of the GPR data.  The GPS data were correlated to maps of the area to give a topographic correction for the GPR profiles. 


GPS measurements were taken along the GPR profiles. 
Results published in Geomorphology, August 2014
Great Lakes Glacial Mapping Results
Geologic Mapping Ground Penetrating Radar
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