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.

本数据集收录大陆边缘计划（Continental Margin Program）所获取的海底沉积物岩性资料。该计划于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，旨在对美国大西洋沿岸的陆架与陆坡实施地质踏勘调查。本数据集仅纳入两类数据：一是缺乏完整粒度分析的记录，二是来自缅因湾、乔治浅滩以及新英格兰东南部陆架与陆坡的测站数据。其余带有详细岩性结构分析的测站数据，以及来自其他区域的测站数据均已被排除。此外，本次采集多数海底样品使用了拖网采泥器，该采样方式会引发淘洗分选作用，导致最终的岩性描述所反映的粒度特征较沉积物实际情况更粗。使用本数据集时请务必谨慎。