We investigated the evolution of Fe distribution with soil age in a marine terrace chronosequence northwest of Santa Cruz, California; where five terraces aged from 65 to 226 Ka have been instrumented. The abundance of pedogenic Fe increases with terrace age. Pedogenic Fe has 2 types of occurrence. At depths < 1m on all terraces Fe forms hard nodules cementing and replacing sediment grains. At depths > 1m in the youngest terrace (T1) disseminated Fe forms as coatings on sediment grains. In terraces 2 thru 5 (depths > 1m) the disseminated iron is concentrated in mottles within an argillic horizon. Iron nodules (0.5mm to 20mm in diameter) are most abundant above 60 cm in terraces 3 thru 5 (corresponding to the maximum level of seasonally perched water). The nodules do not occur in the underlying regolith. Nodules are typically goethite with a subset of maghemite nodules (magnetic). Scanning electron microscopy (SEM) reveals fungal hyphae throughout the nodules and Fe-oxide structures indicating Fe encrustation of fungal networks. Mass change calculations, using bulk soil chemistry, reveal surface iron concentrations that cannot be accounted for by dissolution and compaction of the profile or by the Fe content of eolian additions to the soils. Except during ephemeral saturation events, the terrace regoliths are aerobic and lateral movement of large amounts of reduced Fe is unlikely. How then is Fe vertically mobilized and surficially concentrated? The unweathered sediments contain an Fe-rich smectite which weathers with time to kaolinite; a source of pedogenic Fe. Iron is a plant nutrient, however unlike other mineral nutrients Fe is relatively insoluble in the aerobic soil solution. We propose that plant roots and symbiotic fungi (mycorrhizae) are responsible for movement (biolifting) of Fe from deeper in the regolith. This Fe when released thru plant decay forms immobile Fe oxides at shallow depth. Iron content of the present day grassland vegetation, if cycled over terrace age easily accounts for the amount of Fe build up in these soils.