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

This dataset is the digital compilation of geologic and resource maps provided mostly by State geologic surveys and depicts the projected area of occurrence of the Upper Freeport coal bed. The Upper Freeport coal bed is in Ohio, West Virginia, western Pennsylvania, and western Maryland. The coal bed may extend into eastern Kentucky, but correlations are highly uncertain and do not warrant extrapolation south of the areas shown on this map at this time. This dataset represents the extent of the Upper Freeport coal bed used in the Apalachian coal region assessment. The file has been generalized from detailed geologic coverages found elsewhere in Professional Paper 1625-C.本数据集为多数由各州地质调查局提供的地质与资源地图的数字化汇编，旨在描绘上弗里波特煤层（Upper Freeport coal bed）的预测赋存范围。该煤层分布于俄亥俄州、西弗吉尼亚州、宾夕法尼亚州西部及马里兰州西部。该煤层或可延伸至肯塔基州东部，但目前的地层对比结果存在高度不确定性，暂不支持对本地图所示区域以南的范围进行外推。本数据集呈现了阿巴拉契亚（Apalachian）煤炭区域评估中所采用的上弗里波特煤层分布范围。本数据集文件源自《专业报告1625-C》其他章节的详细地质填图成果，并进行了概化处理。