The sediments of Hole 1020B have high biogenic carbonate concentrations during glacial periods and high biogenic silica concentrations during interglacial periods. This variability should be caused by glacial-interglacial variations in the origin and character of deep-water masses. Future work, such as calculating mass accumulation rates for each component and analyses of other proxies, is necessary to confirm the observed changes in the production and burial of biogenic components.