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Lexicon Of Bedrock Stratigraphic Names Of North Dakota, Joanne Van Ornum Groenewold

Theses and Dissertations

This lexicon of bedrock stratigraphic names of North Dakota consists of a general definition of each unit as well as the history of stratigraphic nomenclature, An attempt was made to include all units for North Dakota whether formally or informally named, or cur rently being used in the state. The general definition includes name(s) of the unit, age, area of extent, lithology, relationships to other units, characteristic fossils, economic significance, depo sitional environment, type section (1£ one has been proposed), and other remarks that might be significant. The history of strati graphic nomenclature includes a chronological listing of the first …

The Geohydrology And Hydrogeochemistry Of The Proposed Garrison Lignite Mine, Kevin Morin

Theses and Dissertations

A local groundwater study is a necessity before the opening of any lignite mine in North Dakota. The study becomes an important reference for the environmental impact during mining and after reclamation.

This report is a groundwater study of the Proposed Garrison Lignite Mine, McLean County, North 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 site.

Ninety piezometers in twenty-eight nests were …

Petroleum Potential Of The Tilston Interval (Mississippian) Of Central North Dakota, John P. Himebaugh

Theses and Dissertations

The Tilston interval sediments were deposited on the eastern flank of the Williston basin of North Dakota, Manitoba and Saskatchewan. The interval (Osagian) is composed of a basal carbonate and upper anhy drite in the predominantly carbonate Mississippian Madison Formation. The interval consists of four major facies (subtidal, shoal, tidal flat and supratidal anhydrite), and two geographically restricted facies (lagoonal and elastic) and represents a regressive sequence.

Tilston deposition began with the subtidal facies, deposited on a broad, shallow shelf. As the sea regressed this was followed by deposition of the shoal facies. Further regression resulted in the deposition of …

Magnetic Anomalies Over A Portion Of The Granite Mountains, Central Wyoming, Larry F. Smyers

Theses and Dissertations

Precambrian rocks exposed in the northern Pathfinder Reservoir area, Natrona County, Wyoming, are partially exhumed crystalline rocks of the northwestern portion of the Granite Mountains. These rocks comprise three major types: (1) the oldest metamorphic rocks, which may represent a metamorphosed sedimentary-volcanic terrane, exposed on Black Rock Mountain and in other small areas south and west of Black Rock Mountain; (2) granites, which intrude the metamorphic sequence, and are exposed on the Sweetwater Rocks and areas marginal to Pathfinder Reservoir; and (3) diabase dikes with northeastern trends that intrude both the metamorphic rocks and granites. Exposures of the Precambrian rocks …

Paleoecology Of Late Quaternary Molluscan-Ostracod Assemblages From The Norwood Site, Southeastern Minnesota, Kevin L. Malmquist

Theses and Dissertations

Well-preserved fossils, including mollusks, ostracods, beetles and plant remains were extracted from sediments at the Norwood Site in southeastern Minnesota during July, 1977. Stratigraphic units, in ascending order, were: (1) sandy claystone, (2) clayey siltstone, (3) sandy siltstone, and (4) laminated peat. Unit 1 was interpreted to be till or sediment that slumped or flowed into the lake. Unit 2 and the lower part of unit 3 were interpreted to be lacustrine sediments. The upper part of unit 3 was interpreted to be a shoreline deposit. Unit 4 was interpreted to be a terrestrial or marginal lacustrine deposit. Total thickness …

Petrology Of The Cenozoic Igneous Rocks Of The Tinton District, Black Hills, South Dakota - Wyoming, John T. Ray

Theses and Dissertations

The Tinton district is located on the northwest flank of the Black Hills uplift, 20 km west of Lead, South Dakota, along the Wyoming South Dakota border. The Tinton or Nigger Hill uplift comprises a central area of domed Precambrian Xstrata with marginal exposures of Paleozoic sedimentary rocks which dip radially outward on all sides. The area was intruded by Cenozoic igneous rocks that include a stock of quartz latite/quartz trachyte porphyry, an alkalic ring dike complex, lamprophyre dikes and intrusive breccia.

Precambrian rocks are represented by a sequence of metapelites thst have been intruded by metabasite and granitic pegmatite …

Geology Of Igneous Extrusive And Intrusive Rocks In The Sundance Area, Crook County, Wyoming, Earl F. Fashbaugh

Theses and Dissertations

Two major igneous rock types occur in the Sundance, Wyoming area including foyaite of the Bear Lodge Mountain sill and quartz latite of Sundance Mountain and Sugarloaf Mountain. The igneous bodies were mapped on a scale of 1:5000 in an effort to determine petrogenetic relationships between the two rock types.

Sundance Mountain and Sugarloaf Mountain are extrusive in origin. Quartz latite occurs as subparallel units of breccia, tuff, and massive flows without any clear cross-cutting relationships. Fragmental types (breccia and cuff) constitute 41 to 76 percent of the rocks, suggesting that Sundance Mountain is a mixed cone. The quartz latite …

Mineralogy And Chemistry Of Clay-Rich Sediments In The Contact Zone Of The Bullion Creek And Sentinel Butte Formations (Paleocene), Billings County, North Dakota, David W. Brekke

Theses and Dissertations

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 from light colors in the Bullion Creek Formation to dark colors in the Sentinel Butte Formation serves as a boundary marker and is widely exposed in the Little Missouri River badlands. The color boundary is a product of weathering and is not readily apparent in the subsurface. The use of clay mineralogy was investigated as …

Depositional Environments And Diagenesis Of The Mississippian Bottineau Interval (Lodgepole) In North Dakota, Thomas J. Heck

Theses and Dissertations

Bottineau interval rocks from the North Dakota part of the Williston Basin comprise a single marine transgression/regression cycle, Early Mississippian (lower Scallion subinterval) marine transgression from the restricted depositional environment of the Bakken Formation resulted in normal marine circulation, Six major facies were developed: (1) the central basin, (2) basin flank, (3) open shelf, (4) crinoidal mudstone, (5) gray shale, and (6) restricted shelf. Marine transgression continued until upper Scallion subinter val time, by which time the open shelf facies had already prograded over the gray shale and crinoidal mudstone facies.

Marine regression had begun by middle Bottineau interval (Virden …

Applied Geology In The Beulah-Hazen Area, Mercer County, West-Central North Dakota, Gary N. Meyer

Theses and Dissertations

Increased lignite development around the small towns of Beulah and Hazen, North Dakota, will cause rapid growth and necessitate the develop ment of new subdivisions and expansion of present sewage disposal facili ties. A detailed geologic study of a 9 0-square mile area surrounding the two towns was undertaken to provide information valuable to those concerned with proper management of this growth. A surface and near-surface materials map was prepared at a scale of 1:24, 000 showing relative depths and thicknesses of a maximum of three earth materials to a depth of 9 m. Eleven units were mapped at the …