Figure F15. Diagram illustrating common relationships between lithology, clast count, and physical properties at the lithostratigraphic Subunit IB–Unit II transition (Sections 341-U1417C-17H-3A through 18H-1A). Decreases in magnetic susceptibility, gamma ray attenuation (GRA) bulk density, and natural gamma radiation, combined with increases in color reflectance index, highlight the location of diatom ooze. Mafic-rich sand corresponds to an increase in magnetic susceptibility, whereas volcanic ash dominated by glass shards shows no change in magnetic susceptibility. Photomicrographs of smear slides to right of the figure illustrate major lithologies present over specific intervals.
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