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.

相数据图层（PAC_FAC.txt）是美国太平洋边缘usSEABED数据收集中，针对已知沉积物样品、勘测与探测数据生成的5套点位覆盖数据集之一，该数据集通过dbSEABED软件系统整合完成。此相数据图层涵盖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）及其他合理分类的关联信息。这些数据源自岩心、沉积物抓样、照片与视频的文字描述，且仅适用于由Top、Bottom及SamplePhase字段标记的子样本。指定相字段中的数值"0"并不必然代表该字段所定义的组分缺失，而仅表示该字段缺乏对应观测数据。《Larger_Work_Citation》中的表6（http://pubs.usgs.gov/ds/2006/182/table6.html）列出了各相类型、其贡献组分及相对权重值。