Altitude of the top of the upper Fort Union aquifer in the Williston structural basin
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These data represent the altitude, in feet above North American Vertical Datum of 1988 (NAVD88), of the upper Fort Union aquifer in the Williston structural basin....
本数据集记录了威利斯顿构造盆地（Williston structural basin）内上部弗特尤恩含水层（upper Fort Union aquifer）的海拔高程，其数值以1988北美垂直基准面（North American Vertical Datum of 1988，NAVD88）为基准，单位为英尺。
