Knobloch outcrop, Southern Montana, 1999 National Coal Resource Assessment (knocg.shp)

This ArcView shape file contains a line representation of the Knobloch coal bed outcrop or contact with clinker in the Ashland coalfield as defined in the USGS...本ArcView形状文件（ArcView shape file）包含了美国地质调查局（United States Geological Survey，USGS）所界定的阿什兰煤田（Ashland coalfield）内诺布洛赫煤层（Knobloch coal bed）露头或其与烧结块（clinker）接触带的线状表示形式。