Figure 7. Selected section from RVDune GPR profile (North Beach subcell) showing wave cut platform (BWCP) at 7-8 m depth that cuts into sedimentary bedrock. Holocene progradational shoreface deposits, dipping seaward, overlie the transgressive ravinement surface. This ravinement surface was drilled and dated at nearby sites (Herb, 2000). A basal gravel layer rests on the ravinement surface in this area. The upper 5 m of Holocene progradational facies was vibracored in the RVDune profile (Woxell, 1998). The progradation facies includes medium well-sorted beach sand with rare laminae of coarser sand, fine shell fragments and/or heavy minerals.