Developing a preliminary 3-D model of the Quaternary geology of the Wauconda 7.5' quadrangle

Background. Using data from ISGS boreholes, natural gamma logs of boreholes and water wells, waterwell drillers’ descriptive logs, and water-well samples, we created a preliminary 3-D model of the Quaternary geology of the Wauconda quadrangle. Because only minor deposits of postglacial sediment cover the land surface, too thin to represent on this model, only the glacial deposits are represented. The 3-D model illustrates our present understanding of relationships among Quaternary units. It also shows areas where data are sparse and future drilling, downhole geophysics, and shallow seismic reflection studies should be focused. The digital model can be easily modified as new data become available.