Figure F7. A. Abundance of dispersed "iron sulfide" and macrocrystalline pyrite. Arbitrary units based on core description with the values being averaged over five sections (see "Core Descriptions" contents list). B. Downhole variation in the content of nannofossils. C. Total siliceous organisms (diatoms, sponge spicules, and radiolarians) estimated from smear slides. Note peak in siliceous organisms in Subunit IB and the generally high levels of nannofossils in Subunits IB and IC.