GSV Geological Unit (250K) - Lithology

Geological units represented as two dimensional polygons, designed for portrayal at 1:250 000 scale. The polygon edges are constructed from the corresponding geological contacts and faults layer. Theme adapted from Moyer,Hasting and Raines, 2005 (http://pubs.usgs.gov/of/2005/1314/of2005-1314.pdf) for GeoSciML testbeds.

以二维多边形（two-dimensional polygons）表示的地质单元（Geological units），专为1:250000比例尺的制图展示而设计。多边形边界由对应的地质接触线与断层图层构建而成。本数据集的主题改编自Moyer、Hastings及Raines于2005年发表的研究成果（访问链接：http://pubs.usgs.gov/of/2005/1314/of2005-1314.pdf），供GeoSciML测试床使用。