Great Sound is a shallow lagoon located on the coast of southern New Jersey. The lagoon receives sediment influx from the ocean and is characterized by bioturbated, fine-grained sediment. The apparent Pb-210 accumulation rates (i.e., maximum estimates of accumulation rate) in the lagoon range from 0.1 to 0.5 cm/yr. Subtidal and intertidal deposits are typically silty clay and clayey silt with abundant worm tubes, some shells, and little physical stratification. The deposits of the adjacent salt marsh are silty sands, which are extensively disrupted by roots of Spartina alterniflora . Shallow and fine-grained, Great Sound is typical of a partly closed lagoon with a significant sediment supply. Comparison between mud deposits in Great Sound and transgressive mud deposits buried on the New Jersey continental shelf reveals sedimentological and paleontological differences.