Preliminary report on the geology of the near-surface coal beds in the Knife River area, North Dakota

Coal resource occurrence map and coal development potential map of the Emerson Quadrangle, Dunn County, North Dakota

“…Drill hole data and projected coal outcrop-traces from previous investigations (Law, 1977) These sediments, which comformably overlie the Sentinel Butte member, have been eroded away in much of the study area.…”

“…The most important sources of data were Klausing (1976), Law (1977), and USGS and NDGS (1976 For instance, in some drill holes, where coal intervals were not noted and the data appeared anomalous in relation to data from adjacent drill holes, rather than plot a zero coal thickness, the coal bed was assumed to be laterally extensive.…”

“…Surficial materials generally mask most of the older stratigraphic units, making it difficult to assess the importance of minor faulting. Coal outcrop traces were projected from structure contour maps and checked against previously projected outcrops (Law, 1977). An overlay of the structure contour and topographic maps provides data for computation of overburden thickness.…”

Coal resource occurrence map and coal development potential map of the Dunn Center NE Quadrangle, Dunn County, North Dakota

“…The most important sources of data were Electric Log Services (1977), Klausing (1976), Law (1977), and USGS and NDGS (1976). were not noted and the data appeared anomalous in relation to data from adjacent drill holes, rather than plotting a zero coal thickness, the coal bed was assumed to be laterally extensive.…”

“…Drill hole data and projected coal outcrop traces from previous investigations (Law, 1977) Ludlow rocks deposited in a continental environment.…”