Uninterpreted seismic profile illustrates the limited acoustic penetration in the deformed limestone bedrock. The acoustic contrast between the Holocene sediment cover and the Pleistocene exposure surface is variable and can be difficult to resolve. This is typical throughout the region and is attributed to the karst and weathered nature of the underlying bedrock. The modern sediment cover is usually less than 2 to 3 m thick, corresponding with the higher-relief portions of the sand waves or ridges seen here. Just off the beach on this profile is a several-meter-high limestone outcrop - a very rare occurrence in the overall study area. The outcrop may indicate a nearshore limestone terrace that was bypassed by the developing barrier island in this area - perhaps due to a lack of sediment supply sufficient to maintain the barrier. The barrier now fringes the pre-Holocene mainland structure high.