Sam Panno explores a crevice type cave in northeastern Illinois.

Steve Sargent prepares explosives for seismic refraction survey.

Test drilling the Mahomet Aquifer.

ISGS staff members Phil Reed, Dave Larson, and Bev Herzog work with driller Jet Hall in preparing to run a geophysical log.

Keith Hackley sampling an Illinois State Water Survey well drilled into the Mahomet Aquifer near Paxton, Illinois.

Test pumping for the village of Homer. This well field was located based on the results of an electrical earth resistivity survey.

Sam Panno sets up an automatic sampler at a spring in southwestern Illinois.

Sam Panno and Sam Indurante of the Illinois Department of Agriculture record descriptions of soils exposed in a fresh sinkhole collapse.

Robert Vaiden describes the geological history of Illinois using a hands-on demonstration called Build Illinois, as part of our Geoscience Education program.