Dave Kirschner of Saint Louis University is serving as the onsite Core Manager at SAFOD during Phase 3. He is shown here with Brad Carkin of the USGS working on the calibration of a GeoTek core scanner, loaned to SAFOD by the USGS Marine Geology group. The core scanner will be used to photograph the core and measure a variety of geophysical properties (density, magnetic susceptibility, resistivity).