Altitude of the top of the Upper Hell Creek hydrogeologic unit in the Powder River structural basin
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These data represent the altitude, in feet above North American Vertical Datum of 1988 (NAVD88), of the Upper Hell Creek hydrogeologic unit in the Powder River basin....
本数据集记录了粉河盆地内上赫尔克里克水文地质单元的海拔高程，该高程以1988年北美垂直基准面（North American Vertical Datum of 1988, NAVD88）为基准的英尺数表示……
