Lithologic Descriptions from the Continental Margin Program (HATHLITH71 shapefile)

This data set contains lithologic information on bottom sediments from the Continental Margin Program. The program was a joint collaboration between the U.S. Geological Survey and the Woods Hole Oceanographic Institution during the 1960s to conduct a geological reconnaissance investigation of the continental shelf and slope off the Atlantic coast of the United States. Only those records without complete size analyses and only those stations from the Gulf of Maine, Georges Bank, and southeastern New England shelf and slope are included in this data set. Other stations where detailed textural analyses are available or are from other areas have been excluded. Furthermore, dredges were used to collect most of the bottom samples, resulting in winnowing that has resulted in lithologic descriptions that are texturally coarser than actually present. Care should be taken when using this dataset.本数据集包含源自大陆边缘计划（Continental Margin Program）的海底沉积物岩性信息。该计划是20世纪60年代由美国地质调查局（U.S. Geological Survey）与伍兹霍尔海洋研究所（Woods Hole Oceanographic Institution）联合开展的项目，旨在对美国大西洋沿岸的大陆架与陆坡开展地质踏勘调查。本数据集仅纳入未完成完整粒度分析的记录，以及来自缅因湾、乔治浅滩与新英格兰东南部陆架及陆坡的测站数据；其他具备详细结构分析数据或源自其他区域的测站均已被排除。此外，绝大多数海底样品采用挖泥采样装置采集，由此产生的淘洗分选作用使得岩性描述的沉积物结构相较于实际赋存状态更为粗化。使用本数据集时需格外谨慎。