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Showing 1 to 20 of 24 for “"Sentinel Butte Formation"”.

  1. Petrology of the Sentinel Butte Formation (Paleocene), North Dakota

    Forsman, Nels F.

    <p> Sedimentary materials of the Sentinel Butte Formation have been petrographically examined using optical and scanning electron micro scope/microprobe techniques. The formation consists of fine-grained materials which generally are classified mineralogically as volcanic litharenites or …

    nodak Repository record

  2. Non-Lignite Marker Beds in the Sentinel Butte formation, McKenzie and Dunn Counties, North Dakota

    Stancel, Steven G.

    <p>Non-lignite marker beds in the Sentinel Butte Formation have been noted by several authors (Fisher, 1953; Meldahl, 1956; Clark, 1966; Royse, 1970; Cherven, 1973; Johnson, 1973). Five non-lignite marker beds listed by Royse (1970): 1) basal sand bed, 2) blue bed, 3) lower yellow bed, 4) upper …

    nodak Repository record

  3. Petrology of the Beulah-Zap lignite bed, Sentinel Butte Formation (Paleocene), Mercer County, North Dakota

    Kleesattel, David R.

    … several economically important lignites in the Sentinel Butte Formation (Paleocene). This lignite occurs as a subsurface unit in the Knife River Basin of Mercer and I Oliver counties of North Dakota. The Beulah-Zap lignite is a heterogeneous carbonaceous rock unit composed of megascopic and …

    nodak Repository record

  4. Earliest Known Material of Amia, Bowfin, From The Sentinel Butte Formation (Paleocene), Medora, North Dakota

    Moore, Abby Grace2020

    … species of <em>Amia</em> were found in the Sentinel Butte Formation, a geologic formation of Paleocene age (~ 60 million years ago) near the town of Medora, North Dakota. The specimens are classified as <em>Amia</em> because the coronoid tooth plates exhibit conical teeth and the …

    columbus-state Repository record

  5. Depositional environments of the upper part of the Sentinel Butte Formation, southeastern McKenzie County, North Dakota

    Johnson, Robert Post

    … 40 meter thick interval in the upper part of the Sentinel Butte Formation in southeastern McKenzie County, North Dakota have been determined from the sedimentary structures, geometry, distribution of grain· sizes, and stratigraphic relations of cyclic lithostratigraphic units. The top of the study …

    nodak Repository record

  6. High- and low-sinuosity stream deposits of the Sentinel Butte Formation (Paleocene) McKenzie County, North Dakota

    Cherven, Victor B.

    <p>High-sinuosity channel deposits in the Sentinel Butte Formation occur as elongate, tabular beds of sand that fine upward from an erosional base. The sand beds contain epsilon cross-stratification, within which stratification changes upward from large-scale trough crossstratification to …

    nodak Repository record

  7. Palynology of the Hagel lignite bed and associated strata, Sentinel Butte Formation (Paleocene), in central North Dakota

    Steadman, Edward N.

    … lignite and is the lowest named lignite in the Sentinel Butte Formation, Fort Union Group. The Hagel bed extends throughout the Knife River Basin coal-mining area of central North Dakota. Stratigraphic sections of the Hagel bed, including intercalated clastic rocks, were measured in the …

    nodak Repository record

  8. The stratigraphy and sedimentology of the Sentinel Butte Formation (Paleocene) in south-central Williams County, North Dakota

    Peck, Wesley D.

    … 163 meters (535 feet) of the Paleocene Sentinel Butte Formation crop out in southcentral Williams county, North Dakota. To determine their mode of deposition and stratigraphic position within the formation, twelve stratigraphic sections were measured. These strata were deposited in …

    nodak Repository record

  9. Stratigraphy and sedimentology of the Sentinel Butte formation (Paleocene) near Lost Bridge, Dunn County, west-central North Dakota

    Nesemeier, Bradley D.

    <p>The Sentinel Butte Formation (Paleocene) near Lost Bridge, Dunn County, west-central North Dakota, is 190 meters thick, and is charac terized by four main lithologies: sand, silt, clay, and lignite. The study interval is ISO meters thick, and lies between the basal sand of the formation and the …

    nodak Repository record

  10. Stratigraphy of Paleocene and Pleistocene Sediments Exposed Along Lake Sakakawea in Eastern Dunn and Western and Central Mercer Counties, North Dakota

    Degenstein, Joel A.

    … provide excellent exposures of the Paleocene Sentinel Butte Formation and Pleistocene glacial deposits of the Coleharbor Group. The dominant sediment type in the Sentinel Butte Formation is thinly-bedded silt. Fine sand, clay, and lignite occur in lesser abundance. Lignite, clay, and peat are …

    nodak Repository record

  11. Rates of hillslope lowering in the Badlands of North Dakota

    Tinker, John R., Jr.

    … on the west-facing hillslopes underlain by the Sentinel Butte Formation, 0.14 inch per year on the southwest-facing hillslopes underlain by the Tongue River Formation, and 0.11 inch per year on the northeast-facing hillslopes underlain by the Tongue River Formation. Soil creep occurs mainly on …

    nodak Repository record

  12. Stratigraphy of the upper part of the Fort Union Group in southwestern McLean County, North Dakota

    Hemish, LeRoy A.

    … exposures of bedrock. Outcropping bedrock formations include the Cannonball, Tongue River, and Sentinel Butte Formations, all in the Fort Union Group of Paleocene age.</p> <p>The Cannonball Formation crops out only in the southeastern part of the area studied (at Washburn), where 18 feet of …

    nodak Repository record

  13. Fort Union (Paleocene) mollusks from southern Golden Valley and southeastern Billings counties, North Dakota

    Delimata, John J.

    … species are known to occur in Tongue River Sentinel Butte sediments of parts of Billings, Golden Valley, and Slope Counties in southwestern North Dakota. Tongue River sediments contain all nine of the species which include: two unionids, Plesielliptio priscus (Meek and Hayden) and …

    nodak Repository record

  14. Petrology of sandstones from the Bullion Creek and Sentinel Butte Formations (Paleocene), Little Missouri Badlands, North Dakota

    Steiner, Mark A.

    … of sandstones of the Paleocene Bullion Creek and Sentinel Butte Formations were studied from exposures in the Little Missouri River Badlands in Billings, Golden Valley, and McKenzie Counties, North Dakota. Field work was conducted in the summer of 1977. Stratigraphic sections were measured and …

    nodak Repository record

  15. The geohydrology and hydrogeochemistry of the proposed Garrison Lignite Mine

    Morin, Kevin

    … Dakota. The mineable lignite is in the lower Sentinel Butte Formation (Paleocene). The remainder of the Paleocene material at the proposed mine site is mostly fluvial silty clay deposits with some sand beds. Pleistocene deposits, mostly pebble loam (till), cover the Sentinel Butte at the mine …

    nodak Repository record

  16. Mineralogy and chemistry of clay-rich sediments in the contact zone of the Bullion Creek and Sentinel Butte Formations (Paleocene), Billings County, North Dakota

    Brekke, David W.

    <p> The Bullion Creek and Sentinel Butte Formations (Paleocene) form over 50 percent of the surface and near surface sediments in the North Dakota part of the Williston Basin. These rocks are composed of sandstones, siltstones, claystones, and numerous lignite beds. A distinct surface color change …

    nodak Repository record

  17. Quaternary stratigraphy of the Lake Sakakawea area, Mclean County, North Dakota

    Ulmer, James H.

    … for tens of kilometers along the bluffs: (1) Sentinel Butte Formation (lignite-bearing sediment of Paleocene age), (2) lower Medicine Hill Formation (fluvial sand and gravel), (3) upper Medicine Hill Formation (massive pebble loam with silt and gravel inclusions> glacial sediment), (4) lower …

    nodak Repository record

  18. Characterization of Sentinel Butte Petrified Wood and Host Lithology Associations

    Holweger, Todd Lawrence

    … of petrified wood occur in the Paleocene Sentinel Butte Formation in western North Dakota. An examination of this petrified wood has provided information about modes and degrees of fossilization, silica phases present, organic structure preservation, and parent tree type. In the study …

    nodak Repository record

  19. Sedimentology of the Bullion Creek and Sentinel Butte formations (Paleocene) in a part of southern McKenzie County, North Dakota

    Wallick, Brian P.

    … of deposition of the Bullion Creek and Sentinel Butte Formations (Paleocene) in western North Dakota has been variously ascribed to lacustrine, meandering fluvial, and deltaic settings. The purpose of this study was to interpret the depositional environments, depositional history, and …

    nodak Repository record

  20. The Hydrogeologic effects of fly ash utilization in concrete at Coal Creek Station, Underwood, North Dakota

    Johnson, Terry R.

    … material underlain by Paleocene bedrock of the Sentinel Butte Formation. The fill unit was created by construction projects during the past 10 years. Fill materials are more permeable than bedrock, consequently the occurrence of fill influences recharge rates and ground water flow patterns. …

    nodak Repository record

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