Figure F31. Comparison of magnetic susceptibility from core logging with the multisensor track (MST) measurements of core logs and downhole measurements (pass 1 of the GHMT tool string), of thorium measured by the NGT tool string and photoelectric effect (PEF) from the HLDS, of CaCO₃ from core samples and PEF, and of bulk density from downhole and core logging. MAD = moisture and density, GRA = gamma-ray attenuation, IU = instrument units.