Extent of the Upper Hell Creek hydrogeologic unit in the Powder River and Williston structural basins

These data represent the extent of the Upper Hell Creek hydrogeologic unit in the Powder River and Williston structural basins.本数据集表征了粉河与威利斯顿构造盆地（Powder River and Williston structural basins）范围内的上海尔克里克水文地质单元（Upper Hell Creek hydrogeologic unit）的分布范围。