Altitude of the top of the Upper Hell Creek hydrogeologic unit in the Williston structural basin

These data represent the altitude, in feet above North American Vertical Datum of 1988 (NAVD88), of the Upper Hell Creek hydrogeologic unit in the Williston...本数据集所呈现的为威利斯顿区域内上地狱溪水文地质单元的海拔高度，其数值以英尺为单位，基准为1988年北美垂直基准面（North American Vertical Datum of 1988，NAVD88）。