Geologic Provinces of the Circum-Arctic, 2008 (north of the Arctic Circle)

This shapefile includes arcs and polygons that describe U.S. Geological Survey defined 33 geologic provinces of the Circum-Arctic (north of the Arctic Circle). Each...本形状文件（Shapefile）包含弧段与多边形数据，用于描述由美国地质调查局（U.S. Geological Survey）划定的环北极地区（北极圈以北）的33个地质省。