Pittsburgh Coal Bed Resource Areas in Pennsylvania, Ohio, West Virginia, and Maryland

The base of the Pittsburgh Coal bed and its stratigraphically (non-coal) equivalent horizon is used to subdivide Upper Pennsylvanian Series strata into the overlying Monongahela Group and the underlying Conemaugh Group in the Appalachian Basin coal region. This dataset depicts areas in which Pittsburgh coal resources were calculated and was obtained largely from published maps. Because different coal thickness criteria were used to delineate the line denoting known resources in Ohio versus West Virginia, an offset is observed at the State boundaries. This dataset is a polygon coverage of counties limited to the extent of the Pittsburgh coal bed resource areas. The file has been generalized from detailed coverages found elsewhere in Professional Paper 1625-C.

匹兹堡煤层（Pittsburgh Coal Bed）的基底及其地层学意义上的非煤等效层位，被用于将阿巴拉契亚盆地煤炭产区的上宾夕法尼亚统（Upper Pennsylvanian Series）地层划分为上覆的莫农加希拉群（Monongahela Group）与下伏的科内茅斯群（Conemaugh Group）。本数据集涵盖了匹兹堡煤炭资源的核算范围，其数据主要来源于已公开的相关地图。由于俄亥俄州与西弗吉尼亚州在划定代表已知煤炭资源的边界时采用了不同的煤层厚度评价标准，州界处出现了数据偏移。本数据集为限定于匹兹堡煤层资源分布范围内的县级多边形覆盖数据集（polygon coverage），其数据源自《专业报告1625-C（Professional Paper 1625-C）》中其他区域的详细覆盖数据并经概化处理。