Figure F27. Summary of spectral gamma-ray logs from the hostile environment natural gamma-ray sonde vs. depth, plotted on an expanded depth scale to highlight variations in the interval logged through pipe. From left to right, columns are core recovery; caliper, total gamma radiation (HSGR), and computed (uranium-free) gamma radiation (HCGR); uranium; thorium; potassium; logging units; lithostratigraphic units; and biostratigraphic ages.