Shelf Sediments off Long Island (MCKINNEY70 shapefile)

The detailed nature of relict sediments resulting from and related to the Holocene transgression is revealed through this sedimentological study of a densely sampled corridor across the southern New England continental shelf. These shelf sediments can be divided into an inner and middle clean sand facies and an outer shelf muddy sand facies. Sediment data supports the view that the outer muddy sediment is relict; the sharp "mud line" at about 35 fathoms results not from modern deposition, but from the winnowing more extensive muddy sediment.

本研究通过对新英格兰南部大陆架上一条高密度采样断面的沉积学分析，揭示了全新世海侵成因及与之相关的残留沉积物（relict sediments）的详细特征。该大陆架沉积物可划分为内、中陆架纯净砂相以及外陆架泥质砂相。沉积物数据支持外陆架泥质沉积物属于残留沉积物的观点；约35英寻处的清晰"泥线"并非现代沉积作用所形成，而是广泛分布的泥质沉积物经簸选作用改造的产物。