PAC_FAC: Seabed facies data (combined components) for the continental margin of the U.S. Pacific Coast (California, Oregon, Washington) from usSEABED (pac_fac.txt)

The facies data layer (PAC_FAC.txt) is one of five point coverages of known sediment samples, inspections, and probes from the usSEABED data collection for the U.S. Pacific margin, integrated using the software system dbSEABED. The facies data layer (PAC_FAC.txt) represents concatenated information about components (minerals and rock type), genesis (igneous, metamorphic, carbonate, terrigenous), and other appropriate groupings of information about the sea floor. These data are parsed from written descriptions from cores, grabs, photographs, and videos, and may apply only to a subsample as denoted by the Top, Bottom, and SamplePhase fields. The value "0" in a defined facies field does not necessarily imply lack of the components defining that field, but may imply a lack of data for that field. Table 6 (http://pubs.usgs.gov/ds/2006/182/table6.html) in the Larger_Work_Citation gives for a list of the facies, the contributing components, and relative weights.

沉积相（facies）数据层（PAC_FAC.txt）是美国太平洋陆缘usSEABED数据集中的5个已知沉积物样本、勘测与探测点覆盖图层之一，该数据集通过dbSEABED软件系统整合而成。该相数据层整合了与海底相关的组分（矿物与岩石类型）、成因（火成、变质、碳酸盐、陆源）以及其他合理的信息分组内容。此类数据源自岩心、海底取样器、照片及视频的文字描述，且仅适用于由Top、Bottom及SamplePhase字段标记的子样本。已定义的相字段中取值为“0”，并不必然代表该字段对应的组分缺失，而可能表示该字段无有效数据。参考文献Larger_Work_Citation中的表6（http://pubs.usgs.gov/ds/2006/182/table6.html）列出了各沉积相类型、对应贡献组分及相对权重。