Unioned layer for the the Decker coalfield, Montana (dkfing.shp)

This ArcView shapefile contains a polygon representation
of numerous themes for the Decker coalfield. These
themes are listed in the process steps. Its sole purpose is
to allow the users to perform multiple theme queries. This
theme was created specifically for the National Coal
Resources Assessment in the Northern Rocky Mountains
and Great Plains Region.

本ArcView形状文件（ArcView shapefile）以多边形要素形式存储了德克尔煤田的多个专题图层，所有专题图层均已在处理步骤中列明。该数据集的唯一用途是支持用户开展多专题查询操作。本数据集专为北落基山脉与大平原地区的全国煤炭资源评估工作而构建。