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.本数据集表征了鲍威尔河构造盆地（Powder River structural basin）与威利斯顿构造盆地（Williston structural basin）内的上赫尔克里克水文地质单元（Upper Hell Creek hydrogeologic unit）的分布范围。