Figure F23. Summary of spectral gamma-ray logs from the hostile environment natural gamma-ray sonde plotted vs. depth (mbsf) for the open-hole logged interval. From left to right, columns are core recovery, total gamma radiation (HSGR) and computed (uranium free) gamma radiation (HCGR), uranium, thorium, potassium and caliper, logging units, lithostratigraphic units, and biostratigraphic ages.