This file contains a layer file and shapefile of the lacustine clay/diamicton thickness 
for the Oak Openings study area.  It was created from Ohio Department of Natural Resource 
well log data using the kriging function in ESRI's ArcGIS geostatistical analyst.  
This layer is also known as "drift".  The file also contains a database of the ODNR
private wells used to create the thickness map along with the shapefile of the well
locations.