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Articles 57211 - 57240 of 59534
Full-Text Articles in Entire DC Network
Corals Of The St. Louis Limestone In The Area Of Calhoun County, Illinois And St. Louis County, Missouri, William Earl Collins
Corals Of The St. Louis Limestone In The Area Of Calhoun County, Illinois And St. Louis County, Missouri, William Earl Collins
Masters Theses
"The St. Louis Limestone and its equivalent formations crop out from Alaska south to Sonora and from Arizona east to Virginia. The St. Louis, in most cases, is fossiliferous and contains numerous species of foraminifers, echinoderms, bryozoans, molluscans, brachipods, arthropods and coelenterates. Algal mounds and mats are common. The rugose coral fauna of the Middle Mississippian (Meramecian) St. Louis Limestone of southern Calhoun County, Illinois and northern St. Louis County, Missouri was studied to determine first what corals were present and second the validity of the names assigned to the previously described species. It was found that the binomen for …
Structure And Chemical Composition Of The Otoliths Of Cyprinus Carpio, Larry Paul Coen
Structure And Chemical Composition Of The Otoliths Of Cyprinus Carpio, Larry Paul Coen
Masters Theses
"The need for the study of microfossils such as foraminifera, conodonts, and otoliths as stratigraphic tools has been well established. However, disarticulated parts such as otoliths and conodonts cannot be effectively used unless they can be recognized. Otoliths, although somewhat unrecognized in the geological record, are far more abundant than articulated skeletons (Frizzell, 1965, p. 86). Therefore, much investigation is being conducted to reveal the origin, function, morphology, and usefulness of the otoliths of fishes.
In this investigation, the asteriscus, well developed only in Ostariophysins (of which the carp is a member), is studied for morphology. New tentative terms are …
Heavy Metals In The Main Streams Of The James River Basin, Missouri, Richard Jerome Lance
Heavy Metals In The Main Streams Of The James River Basin, Missouri, Richard Jerome Lance
Masters Theses
"Demands on water resources in the James River basin have greatly increased. Industrial plants and lead-zinc prospects in the basin are potential sources of heavy metal additions to the waters of the area. The study determines the heavy metal content and distribution in the streams of the basin.
Approximately 50 water samples were collected each season and analyzed by atomic absorption techniques. Field determinations of temperature, specific conductance, pH, and effective alkalinity were also made.
Ranges of heavy metal content were: (1) mercury- <0. 1 to 0.3 ppb (summer only); (2) zinc-
The urban areas of Springfield contribute dissolved heavy metals to the surface streams. The Southwest Springfield Sewage …
0.>A Study Of A New Hydrometallurgical Treatment For New Lead Belt Chalcopyrite Concentrates, Larry Steven Livingston
A Study Of A New Hydrometallurgical Treatment For New Lead Belt Chalcopyrite Concentrates, Larry Steven Livingston
Masters Theses
"A two-phase research project was conducted on chalcopyrite concentrates from the New Lead Belt of Missouri. Phase one includes an ore microscopy study of the Magmont and Viburnum chalcopyrite concentrates in respect to mineralogy, particle size and interlocking characteristics of ore minerals and their possible relationships to poor chalcopyrite-galena separation in the copper flotation circuits.
Results of the ore microscopy study of the Magmont and Viburnum mines chalcopyrite concentrates suggest that interlocking of chalcopyrite and galena are not the cause of poor chalcopyrite-galena separation in the copper flotation circuits.
The most common sulfides found in the Magmont and Viburnum chalcopyrite …
Multispectral Analysis Of Erts Imagery By Color Enhancement, John F. Peters
Multispectral Analysis Of Erts Imagery By Color Enhancement, John F. Peters
Masters Theses
"The Earth Resources Technology Satellite (ERTS) program has supplied the scientist with high resolution multispectral imagery of a large portion or the earth. Photographic and electronic methods of image enhancement are not universally available to those who might profit from such endeavors.
Diazo products were found to be satisfactory for creation of false color enhancement of ERTS multispectral data. The purpose of the enhancement was to make the Diazochrome composite comparable to more sophisticated methods for the purpose of interpretation. The basis of the enhancement was the standard false color infrared composite, with negative and positive Diazochrome masks to enhance …
Distribution Of Trace Elements In Host Rock Limestone In The Tri-State Zinc-Lead District, Dinesh Jashbhai Patel
Distribution Of Trace Elements In Host Rock Limestone In The Tri-State Zinc-Lead District, Dinesh Jashbhai Patel
Masters Theses
"The trace metal contents of limestone in the Tri-State zinc-lead district were determined within a single horizon, the M bed. Ninety-six specimens, collected for a previous study of their petrographic character, were analyzed for zinc, lead, and copper using atomic absorption spectrophotometric techniques.
The unaltered M bed limestone at a distance from ore bodies was found to contain only 12-28 ppm zinc, 40-SO ppm lead and 12 ppm or less copper. Those limestone specimens which were found b earlier petrographic study to be altered principally to sparry calcite commonly contain anomalous amounts of zinc and lead. Some also have slightly …
Description And Origin Of Carbonate Minerals In The Upper And Lower Cherty Members Of The Biwabik Formation, Minnesota, Leslie R. Honeyman
Description And Origin Of Carbonate Minerals In The Upper And Lower Cherty Members Of The Biwabik Formation, Minnesota, Leslie R. Honeyman
Theses and Dissertations
This study was done for the Erie Mining Company after periodic problems with the quality of pellets from taconit2 of the Biwabik Formation had been linked to the presence of carbonate minerals. The carbonates found in the cherty members of the Precambrian Biwabik Formation are predominantly siderite, ankerite, and calcite. Siderite is the only primary carbonate mineral and occurs in three forms: microgranular, granular (oolitic), and crystalline aggregates (recrystallized). Ankerite is a secondary mineral occurring as crystalline aggregates and alteration rims on granular siderite. Calcite is found only in fractures and fault zones. Siderite formed from the original precipitate and …
Depositional Environments Of The Lower Tullock Formation (Paleocene), Slope County, Southwestern North Dakota, William K. Hickey
Depositional Environments Of The Lower Tullock Formation (Paleocene), Slope County, Southwestern North Dakota, William K. Hickey
Theses and Dissertations
The lower Tullock Formation (Paleocene), which consists of a section 5 to 30 feet thick, was studied in Slope County, southwestern North Dakota to determine its depositional environments. The lithol ogies present are sand, silt, clay and lignite. A bed of lignite or yellow silt marks the base of the Tullock Formation throughout the study area.
The silt beds are interpreted as having been deposited as natural levees because they are wedge-shaped and contain climbing ripple cross-stratification, interbedded sand lenses and lignitized paleo-raot systems. Well-drained swamp deposits are difficult to distinguish, but are probably located in the silt beds.
There …
Quaternary Stratigraphy Of The Lake Sakakawea Area, Mclean County, North Dakota, James H. Ulmer
Quaternary Stratigraphy Of The Lake Sakakawea Area, Mclean County, North Dakota, James H. Ulmer
Theses and Dissertations
The Quaternary stratigraphy of central North Dakota is best exposed along the nearly continuous, 20-meter-high, vertical bluffs of Lake Sakakawea in the Missouri River trench. The following lithostratigraphic units (in ascending order) are exposed just north of Riverdale, North Dakota, and can be correlated 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 Horseshoe Valley Formation (fluvial sand and gravel), (5) upper Horseshoe Valley Formation (jointed pebble-loam, …
Ordovician Corals Of The Williston Basin Periphery, Frank P. Caramanica
Ordovician Corals Of The Williston Basin Periphery, Frank P. Caramanica
Theses and Dissertations
Tabulate and rugose corals are described from the Ordovician Red River) Stony Mountain, and Stonewall Formations in southern Manitoba and the Ordovician Bighorn Formation in northern Wyoming. Fifty-four species, 12 of which are new, are distributed in 20 genera. The Flower Model of coral evolution, based on wall microstructure of colonial corals, is extended to include the septa! Microstructure of colonial and solitary corals. "Primitive" corals are characterized by non t-rabeculate walls and septa whereas "advanced" forms are characterizedby trabeculate walls and septa. "Mid-range" corals are those with intermediate stages of trabecular development in walls .and septa. Corals in the …
High- And Low-Sinuosity Stream Deposits Of The Sentinel Butte Formation (Paleocene) Mckenzie County, North Dakota, Victor B. Cherven
High- And Low-Sinuosity Stream Deposits Of The Sentinel Butte Formation (Paleocene) Mckenzie County, North Dakota, Victor B. Cherven
Theses and Dissertations
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 horizontal stratification and small-scale crossstratification, indicating upward decrease in flow regime due to accretion of laterally-migrating point bars. Inset in the sand beds are channelplug deposits that are narrow and arcuate in map view and asymmetrically trough shaped in cross-section, and consist of sandy silt and clay. Lowsinuosity channel deposits occur as elongate, trough-shaped sand beds that fine upward from a deeply-channeled …
Heavy Minerals Of Glacial Sediments In The Area Of Red Lake Falls, Minnesota, Howard Hobbs
Heavy Minerals Of Glacial Sediments In The Area Of Red Lake Falls, Minnesota, Howard Hobbs
Theses and Dissertations
Pleistocene lithostratigraphic units containing glacial sediments in the Red Lake Falls, Minnesota, area and adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; the Gervais Formation contains a pyroxene-hornblende assemblage. The mean proportion of the constituent minerals is different in each formation; however, there is overlap in the ranges of heavy mineral proportions among the formations. The Red Lake Falls Formation can be subdivided on the basis of garnet abundance.
Depositional Environments Of The Upper Part Of The Sentinel Butte Formation, Southeastern Mckenzie County, North Dakota, Robert Post Johnson
Depositional Environments Of The Upper Part Of The Sentinel Butte Formation, Southeastern Mckenzie County, North Dakota, Robert Post Johnson
Theses and Dissertations
The depositional environments of a 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 interval is the top of the upper yellow marker bed.
An elongate, tabular sand bed was studied in detail. It is 12 meters thick and 3 kilometers wide and it is interpreted to have been deposited by lateral accretion in a high-sinuosity stream. Paleo current indicators are parallel to the long axis …
Quaternary Geology Of Sargent County, North Dakota, Dennis N. Neilsen
Quaternary Geology Of Sargent County, North Dakota, Dennis N. Neilsen
Theses and Dissertations
Sargent County, in southeastern North Dakota, was glaciated during the Pleistocene Epoch. Objectives of a study of Sargent County were to (1) describe the surface sediment and interpret its origin, (2) correlate, where possible, this sediment with that of adjacent areas, and (3) recon struct the general geologic history of the county for the Quaternary Period.
A geologic map of the county was prepared using field data, topo graphic maps, aerial stereopairs, and soil maps. A map showing surface sediment origin was subsequently made using the available field and laboratory information.
Most of Sargent County is typical rolling prairie underlain …
Latest Cenozoic Stratigraphy Of Lake Sakakawea Area, Northeast Mercer County, North Dakota, Donald Kieth Sackreiter
Latest Cenozoic Stratigraphy Of Lake Sakakawea Area, Northeast Mercer County, North Dakota, Donald Kieth Sackreiter
Theses and Dissertations
The latest Cenozoic in northeast Mercer County, North Dakota, is represented by five formations. They are, from bottom to top: the Charging Eagle Formation, the Medicine Hill Formation, the Snow School Formation, the Coteau Formation, and the Oahe Formation.
The Charging Eagle Formation is mainly fluvial sediment. Most of the sediment was derived from the west with only minor amounts from the northeast. It contains the first evidence of glaciation in the area.
The lower Medicine Hill Formation is mainly sediment deposited by a northeast-flowing ancestor of the Missouri River and by melt-water streams. The upp.er Medicine Hill Formation is …
Hydrogeology Of A Sanitary Landfill, Mandan, North Dakota, Raymond D. Butler
Hydrogeology Of A Sanitary Landfill, Mandan, North Dakota, Raymond D. Butler
Theses and Dissertations
The data from this study can be applied to much of southwestern North Dakota because the geologic and climatic conditions are similar.
The Mandan landfill is on the Heart River floodplain and next to the river on the north and steep valley wall on the south. The sanitary landfill bas been used for over 20 years.
The only pre-Pleistocene unit exposed is the Cannonball Formation, which is interbedded sand, silt, and clay. Quaternary units consist of till, fluvial sand, silt, clay, and gravel, and eolian sand and silt.
A local flow system recharges on the upland next to the valley …
Stratigraphy And Sedimentary History Of Middle Cenozoic (Oligocene And Miocene) Deposits In North Dakota, William J. Stone
Stratigraphy And Sedimentary History Of Middle Cenozoic (Oligocene And Miocene) Deposits In North Dakota, William J. Stone
Theses and Dissertations
Middle Cenozoic (Oligocene and Miocene) continental deposits of North America have been most studied in southwestern South Dakota and western Nebraska where the White River Group constitutes a fairly complete Oligocene record, and the Arikaree Group of early Miocene age is commonly the sole remaining record of that epoch. Isolated outcrops in adjacent states also offer opportunities for studying the middle Cenozoic history of the Midcontinent but disagreement as to the physical stratigraphy of such deposits has hindered further work in these areas. The main purpose of this study is to present a viable stratigraphic framework for the middle Cenozoic …
Investigation Of Present Thermal Regime Of Missouri River In Missouri, James C. Maxwell
Investigation Of Present Thermal Regime Of Missouri River In Missouri, James C. Maxwell
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The applicability of power spectral density techniques, Fourier series analysis, and linear regression to the mathematical modeling of river water temperature is demonstrated. Consideration is also given to the problem of estimating thermal inputs to rivers from man-made sources such as electrical power plants. First, power spectral density techniques are used in the time-series analysis of water temperature records which were taken from the Missouri River. Two spectral ranges are then studied from the standpoint of their applicability to (1) mathematical model building and (2) detection and identification of cyclic thermal inputs. Next, a Fourier regression fit to the time-series …
Characterization Of Water Movement Into And Through Soils During And Immediately After Rainstorms, C. T. Haan
Characterization Of Water Movement Into And Through Soils During And Immediately After Rainstorms, C. T. Haan
KWRRI Research Reports
The movement of water into and through soils in the unsaturated state is basic to many water resources problems including rainfall-runoff models, ground water recharge, irrigation, drainage, evapotranspiration and the movement of pollutants in soils. This study was conducted in an effort to determine if the flow equation based on Darcy's Law and the continuity equation could be used to describe watershed infiltration and thus be incorporated into hydrologic models.
The results of the study indicate that even on apparently uniform soils there is a great deal of variability in soil water properties. Handling this variability plus the difficulty of …
The Dacites Of The Washakie Needles, Bunsen Peak, And The Birch Hills, Wyoming, And Their Relationship To The Absaroka-Gallatin Volcanic Province, Linda Lou Anderson Love
The Dacites Of The Washakie Needles, Bunsen Peak, And The Birch Hills, Wyoming, And Their Relationship To The Absaroka-Gallatin Volcanic Province, Linda Lou Anderson Love
Earth and Planetary Sciences ETDs
ABSTRACT
TI1e Washakie Needles, Bunsen Peak, and Birch Hills dacites are three of many plugs which intrude the Eocene flows and volcaniclastic rocks of the Absaroka-Gallatin volcanic province. The dacites contain phenocrysts of plagioclase (oligoclase to andesine), biotite, and resorbed quartz. The dacites of the Washakie Needles and Bunsen Peak also contain phenocrysts of hornblende. The rocks of Bunsen Peak and the Birch Hills have two feldspar phases (oligoclase to andesine and sanidine) and quartz in the groundmass. The Washakie Needles dacite groundmass is composed of one feldspar (andesine to anorthoclase) and quartz. The fission track ages of the dacites …
Gravity Survey Of The Mogolion Plateau Volcanic Province, Southwestern New Mexico., Douglas Hugh Krohn
Gravity Survey Of The Mogolion Plateau Volcanic Province, Southwestern New Mexico., Douglas Hugh Krohn
Earth and Planetary Sciences ETDs
A regional gravity survey has been conducted over the Mogollon Plateau, a mid-Tertiary volcano-tectonic complex 125 km in diameter located in southwestern New Mexico. The complete Bouguer gravity map (3 milligal contour interval) shows gravity values ranging form -167 milligals over an outcrop of Precambrian rocks near Silver City, on the southern rim of the Plateau to -251 milligals over an alluvium filled graben east of Reserve, in the northwestern part of the Plateau giving a maximum relief of 84 milligals. Gravity data show that in general the Mogollon Plateau is an area of low density rocks: gravity values within …
The Structural And Metamorphic History Of The Oakhurst Roof Pendant, Mariposa And Madera Counties, California, Lee R. Russell
The Structural And Metamorphic History Of The Oakhurst Roof Pendant, Mariposa And Madera Counties, California, Lee R. Russell
UNLV Theses, Dissertations, Professional Papers, and Capstones
The Oakhurst roof pendant, near Oakhurst, California, consists of three pre-Cretaceous clastic metasedimentary rock units, surrounded and intruded by rocks of the Sierra Nevada batholith. Two zones of probable "sheared granitic" and "ultramafic" rocks trend northwesterly and are approximately aligned with the Foothills fault system farther north.
The dominant mesocopic feature of the pendant is a northwesterly striking foliation which forms a downward converging fan. Earlier-formed hornblende lineations have been transposed into this foliation plane, as shown by Schmidt-net projections.
Rocks comprising the three unites show three textural stages:
1) Early amphiboles and diopside overgrown by later static amphibole pophyroblasts. …
Epeirogenic And Climatic Controls Of Early Pleistocene Fluvial Sediment Dispersal In Nebraska, K. O. Stanley, William J. Wayne
Epeirogenic And Climatic Controls Of Early Pleistocene Fluvial Sediment Dispersal In Nebraska, K. O. Stanley, William J. Wayne
Department of Earth and Atmospheric Sciences: Faculty Publications
The change from Pliocene to Pleistocene fluvial sedimentation in Nebraska is denoted by gravel with relative enrichment of mechanically weak rock species and a two-fold increase in largest clast size. These changes in fluvial sediments suggest modification in degradational energy affecting detritus apparently related to deterioration of climate in the early Pleistocene. Cooler Pleistocene climates with increased moisture resulted in greater discharge and carrying capacity for streams headed in the Rocky Mountains and flowing across Nebraska. These streams carried granitic detritus eastward toward the continental glacier margin in easternmost Nebraska. There, streams flowing off ice sheets carrying sedimentary and metamorphic …
D.O. And Other Tests, Walter A. Lawrance
Mill Pollution, Walter A. Lawrance
Press Reports, Walter A. Lawrance
Pool Studies, Walter A. Lawrance
L.A. General Data, Walter A. Lawrance
Computer Sheets, Walter A. Lawrance
Special Reports, Walter A. Lawrance