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Articles 28231 - 28260 of 29715
Full-Text Articles in Physical Sciences and Mathematics
Nebraska Groundwater Level (Decline & Rise), 1970
Nebraska Groundwater Level (Decline & Rise), 1970
Conservation and Survey Division
No abstract provided.
Groundwater Regions In Nebraska
Groundwater Regions In Nebraska
Conservation and Survey Division
No abstract provided.
Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1970
Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1970
Conservation and Survey Division
No abstract provided.
Distribution And Subdivision Of Precambrian And Lower And Middle Paleozoic Rocks In The Subsurface Of Nebraska, M. P. Carlson
Distribution And Subdivision Of Precambrian And Lower And Middle Paleozoic Rocks In The Subsurface Of Nebraska, M. P. Carlson
Conservation and Survey Division
No abstract provided.
A Comparative Study Of Nickel Sulphide Deposits Within The Area Of The Canadian Shield, Robert G. Kreiner
A Comparative Study Of Nickel Sulphide Deposits Within The Area Of The Canadian Shield, Robert G. Kreiner
Theses and Dissertations (Comprehensive)
In order to plan the future development of the Canadian Shield within a conceptual framework as suggested by the Mid-Canada Corridor concept, both the presently developed and potential, natural resources of this area need to be evaluated for knowledgeable development and management. To this purpose, various areas of nickel sulphide deposits within the area of the Canadian Shield have been studied with the object of determining similar sequences of intrusive events and their spatial relationships.
Within the Sudbury area, Ontario, five periods of intrusive activity have been recognized, each period characterized by an initial intrusion of acidic composition, followed in …
Evaluation And Application Of Dye Tracers In Karst Terrain For Determining Aquifer Characteristics, Milton Frank Bradley
Evaluation And Application Of Dye Tracers In Karst Terrain For Determining Aquifer Characteristics, Milton Frank Bradley
Masters Theses
"As ground water becomes increasingly important as a source of water in the United States, reliable information on the hydrological characteristics of carbonate aquifers must be obtained in order to develop them intelligently. Various tracers have been used in the past to determine if two or more points are connected hydrologically. Today there exists a number of excellent dye tracers and tracer methods have been developed in unconsolidated and clastic aquifers for determining hydrological characteristics. This paper reviews the various dye tracers and methods which might be applied in a carbonate karst terrain using wells as injection and sampling points. …
St. Louis Limestone, Stratigraphy And Petrography, Near Its Type Locality, Abd El-Aziz El-Hady A. Borahay
St. Louis Limestone, Stratigraphy And Petrography, Near Its Type Locality, Abd El-Aziz El-Hady A. Borahay
Masters Theses
"The St. Louis Limestone of the Upper Meramecian Series, Mississippian System, is typically lithographic, light-to light-olive gray in color, dense, and fractures conchoidally. It is brecciated, especially in the lower part, and contains some chert nodules. Oolites are present close to the top of the formation. The Salem-St. Louis contact is placed at the base of the lowest breccia zone and the top of Salem is characterized by crystalline quartz and abundance of chert nodules. The appearance of typical Ste. Genevieve oolites with sand-size quartz grains indicates the St. Louis-Ste. Genevieve contact. The St. Louis Limestone is characterized by dominance …
Molluscan Paleontology Of The Pierre Shale (Upper Cretaceous), Bowman County, North Dakota, Kenneth F. Brinster
Molluscan Paleontology Of The Pierre Shale (Upper Cretaceous), Bowman County, North Dakota, Kenneth F. Brinster
Theses and Dissertations
The Pierre Shale of Campanian and Early Maestrichtian age in Bowman County, southwestern North Dakota, has an abundant molluscan fauna and 51 species are described herein. The 51 species consist of 1 species of scaphopod, 13 species in 11 genera of gastropods, 24 species' in 17 genera of bivalves, and 13 species in 6 genera of cephalopods.
The stratigraphy of the Pierre Shale in Bowman County was not compiled into a composite section because of the homogeneity of the shale, the lack of distinctive lithologic units, and the slumped condition of the shale. However, the biostratigraphic position of the Bowman …
Authigenic Analcite In The Golden Valley Formation Southwestern North Dakota, Marvin J. Furman
Authigenic Analcite In The Golden Valley Formation Southwestern North Dakota, Marvin J. Furman
Theses and Dissertations
Authigenic analcite constitutes up to about 60 percent of a massive, arksosic sandstone exposed on major buttes in the North Dakota Badlands. The analcite constitutes up to about 80 percent of a thin analcimolite bed at the top of the arkose unit. The analcite occurs as spherulites in the interstices of the arkose and as a cement in the analcimolite. Three types of spherulites are recognized: (1) spherulites with an internal radial structure; (2) spherulites with a massive center and a peripheral radial structure; and (3) spherulites lacking an internal radial structure or having a poorly-defined internal structure. The spherulites …
Petrography Of Xenolith Zones In The Black Face-Ames Plutons, Western San Juan Mountains, Colorado, Richard B. Moore
Petrography Of Xenolith Zones In The Black Face-Ames Plutons, Western San Juan Mountains, Colorado, Richard B. Moore
Theses and Dissertations
The middle to late Tertiary Black Face-Ames plutons are irregularly-shaped, intrusive bodies located in the San Miguel Mountains of southwestern Colorado. The Ames pluton is generally a composite sill; the Black Face pluton is an asymmetric laccol1th. The two plutons are probably joined at depth, and together they form a crudely annular outcrop pattern, open toward the west. The principal rock type within the plutons is granodiorite porphyry, although part of the Ames pluton consists of porphyritic rhyodacite.
Two major zones of xenoliths of Precambrian rock occur within the Black Face-Ames plutons; scattered xenoliths are found at widely separated locations. …
Flow Direction Of Volcanic Rocks In The Northern Part Of The Mogollon-Datil Province, New Mexico, Glenn Alan Krimsky
Flow Direction Of Volcanic Rocks In The Northern Part Of The Mogollon-Datil Province, New Mexico, Glenn Alan Krimsky
Earth and Planetary Sciences ETDs
The northern part of the Mogollon-Datil province is located on the margin of the mid-Tertiary volcanic province of southwest New Mexico. The techinique established b Smith (1967) for determining flow direction of volcanic rocks was applied, for the first time, to determine flow direction and source areas of volcanic rocks form uncertain centers.
The Lower volcanic Group, which contains thick sequences of rhyolltes, latites, and andesites between 38 and 29 m.y. old, originated from two volcanic centers. Source area for the Datil formation, comosed of the Spears and Hells Mesa Members, is in the northern San Mateo Mountains. The Tda …
Effective Rates Of Evaporation And Chemical Properties Of The Precipitates., John Lincoln Rasho
Effective Rates Of Evaporation And Chemical Properties Of The Precipitates., John Lincoln Rasho
Earth and Planetary Sciences ETDs
An experiment was designed to simulate the evaporation of sea water in the laboratory. The experiment was conducted isothermally at 35 1. Chlorinity, salinity, and density of the solution were determined at different stages of evaporation. Also the trace element contents of Sr, Rb, K, and Li of the precipitates were determined to study the possible changes, and the significance of these changes, in the concentration of these trace elements in solution at different stages of evaporation.
The results of this experiment and the work of previous investigators indicate that the rate of crystallization from sea water, at any given …
Geology Of The Moose River And Roach River Synclinoria, Northwestern Maine, Arthur J. Boucot, Edward W. Heath
Geology Of The Moose River And Roach River Synclinoria, Northwestern Maine, Arthur J. Boucot, Edward W. Heath
Maine Collection
Geology of the Moose River and Roach River Synclinoria, Northwestern Maine
by Arthur J. Boucot, with contributions by Edward W. Heath
Bulletin No.21, Maine Geological Survey
Department of Economic Development, Augusta, Maine (August, 1969).
Contents: Abstract / Introduction / Stratigraphy / Intrusive Rocks / Metamorphism / Structure / Large Scale Maps / Somerset Island / Lobster Island / Historical Geology / The Problem of Shell Beds / References / Appendix I /
The 1966 Eruption Of Izalco Volcano, El Salvador, William I. Rose, Richard E. Stoiber
The 1966 Eruption Of Izalco Volcano, El Salvador, William I. Rose, Richard E. Stoiber
Department of Geological and Mining Engineering and Sciences Publications
During October–November 1966 900,000 m3 of olivine basalt flowed from the flank of Izalco volcano, El Salvador. The total heat energy was approximately 1015 calories. No measurable changes in gravity occurred at stations on the active cone between August 1964 and August 1967. In the summit crater fumaroles have surface temperatures as high as 540°C. The cooling rate of these fumaroles was 18°C/yr before the eruption and 45°C/yr after. Yearly temperature cycles due to wet and dry seasons are superimposed on the general cooling trend. The rate of gas emission at four fumaroles in November 1967 was 86 …
Geology Of Part Of The Creston Range, Mora County, New Mexico, Tim T. Schowalter
Geology Of Part Of The Creston Range, Mora County, New Mexico, Tim T. Schowalter
Earth and Planetary Sciences ETDs
The low hills and hogback ridges of the Creston Range form the southeastern edge of the Sangre de Cristo Mountains.
Rocks ranging from Precambrian to Quaternary are exposed in the Creston Range. The Precambrian rocks consist of generally foliated, medium-grade metamorphics intruded by concordant, simple pegmatites. These rocks have been subjected to at least two episodes of deformation of Precambrian age. Approximately 9,000 feet of sedimentary rocks of Devonian (?)-Mississippian to Permian age that were deposited in an intracratonic basin to shelf environment are present. Tertiary-Quaternary rocks are represented by outliers of a basalt flow from the Ocate colcanic field …
Water Levels In Observation Wells In Nebraska, 1968, C.F. Keech, G.R. Svoboda
Water Levels In Observation Wells In Nebraska, 1968, C.F. Keech, G.R. Svoboda
Conservation and Survey Division
No abstract provided.
Late Cenozoic Geomorphic History Of Lee Canyon, Spring Mountains, Nevada, John Henry Gucwa
Late Cenozoic Geomorphic History Of Lee Canyon, Spring Mountains, Nevada, John Henry Gucwa
UNLV Theses, Dissertations, Professional Papers, and Capstones
Located in the west central portion of Clark County, Nevada, the Spring Mountain Range borders the western edge of the Las Vegas Valley. Within the mountain range, a fault block, there are several canyons whose geomorphic history is closely related to the geomorphic history of the major alluvial fans which flank the mountains. Lee Canyon, which is the study area is one of these canyons. In Lee Canyon is preserved a complex canyon fill which has been subjected to several periods of down-cutting and valley-widening. The details of the canyon's geomorphic history recorded by filling and fill removal has not …
Effect Of Supersaturation On The Kinetics Of The Gypsum-Anhydrite Transition., Pao-Chin Chao
Effect Of Supersaturation On The Kinetics Of The Gypsum-Anhydrite Transition., Pao-Chin Chao
Earth and Planetary Sciences ETDs
Gypsum and anhydrite have been found extensively in evaporite beds. Gypsum is the low-temperature, hydrous form of calcium sulfate, while anhydrite is the high-temperature, anhydrous form. The temperature of gypsum-anhydrite transition has been fixed, by both solubility measurements and thermodynamic calculations, in the range of 38 to 42°c in pure water; and at lower values with increasing NaCl content in the solutions. However, the precipitation of anhydrite has never been obtained experimentally in its own stability field, gypsum is always metastably formed instead.
Many investigators believe that the primary precipitation of anhydrite from solutions is improbable. It is usually converted …
Environmental Analysis Of The Swan Peak Formation In The Bear River Range, North-Central Utah And Southeastern Idaho, Philip L. Vandorston
Environmental Analysis Of The Swan Peak Formation In The Bear River Range, North-Central Utah And Southeastern Idaho, Philip L. Vandorston
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The Swan Peak Formation in the Bear River Range of northern Utah and southeastern Idaho varies in thickness from 0 feet to over 400 feet. It consists of three units: (1) a lower unit of interbedded quartzites, shales, and limestones; (2) A middle unit of interbedded quartzites and shales; (3) An upper unit of nearly homogeneous quartzites. The different sedimentary structures, ichnofossils, body fossils, and mineral compositions of each unit represent different environments of deposition. The lower unit probably was deposited in a shallow-shelf environment, and its sediments grade upward into probably shoreface-, tidal-flat-, and lagoonal deposits of the middle …
Some Aspects Of Geochemistry And Mineralogy Of Bear Lake Sediments, Utah-Idaho, Dean F. Davidson
Some Aspects Of Geochemistry And Mineralogy Of Bear Lake Sediments, Utah-Idaho, Dean F. Davidson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Bear Lake is located in southeastern Idaho and north-central Utah. The lake has a maximum altitude of 5923 feet and an area of approximately 110 square miles. Surrounding the lake are carbonates, shales, and sandstones of lower Paleozoic through middle Mesozoic ages. The many streams and springs that originate in these rocks are probably the main contributors to the chemistry of the lake. Water from Bear River, which flows into the north end of the lake, also contributes to its chemistry.
Quartz, aragonite, dolomite, calcite and clay minerals are the main minerals in the lake-bottom sediments. Quartz is generally the …
Structural Geology Of Southeastern Margin Of Bear River Range, Idaho, Clinton L. Davis
Structural Geology Of Southeastern Margin Of Bear River Range, Idaho, Clinton L. Davis
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Seven Cambrian formations and two Ordovician formations, with a total thickness of 9,000 feet, crop out west of the Paris thrust fault and comprise the upper plate. Slices of three Ordovician formations, one Silurian formation, two Mississippian formations, and one formation each of Pennsylvanian and Permian age comprise the low plate. Mesozoic units are not present in the mapped area. Two Tertiary formations and unconsolidated Quaternary deposits are also present.
The major structural feature is the Paris thrust fault which extends north-south throughout the area. It was active during the Laramide orogeny. This fault involved eastward movement and placed Cambrian …
Paleoecology Of The Lowermost Part Of The Jurassic Carmel Formation, San Rafael Swell, Emery County, Utah, R. Joseph Dover
Paleoecology Of The Lowermost Part Of The Jurassic Carmel Formation, San Rafael Swell, Emery County, Utah, R. Joseph Dover
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Paleoecology of the lowermost Carmel Formation, San Rafael Swell, Emery County, Utah, was studied at nine localmes 2 to 21 miles apart. Eight of the sections contain fossiliferous calcilutites and oölmc limestones in the basal 35 to 135 feet measured. Thickness of the fossiliferous beds ranges up to 10 feet. Beds of barren calcilutites, calcarenites, oölmc limestones, intraclastic limestones, calcareous sandstones, and bedded gypsum, separate the fossiliferous beds. A parallel-bedded, basal quartz sandstone, 0.5 to 7 feet thick, everywhere overlies the Navajo Formation.
Molluscs dominate faunal assemblages. Shells are recrystallised to calcite, but external sculpture is preserved in sufficient detail …
The Hyrum And Beirdneau Formations Of North-Central Utah And Southeastern Idaho, James F. Eliason
The Hyrum And Beirdneau Formations Of North-Central Utah And Southeastern Idaho, James F. Eliason
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The Hyrum and Beirdneau Formations of North-central Utah and Southeastern Idaho represent rocks of late Middle Devonian (Givetian) to upper Upper Devonian (Famennian) age. They are disconformably underlain by the Early Devonian Water Canyon Formation in most cases and disconformably overlain by the Devonian-Mississippian Leatham Formation or the Mississippian Lodgepole Formation.
The Hyrum Formation is divided into five members based on lithology and color changes. The five members are: (1) Samaria, (2) Lower Dolomite, (3) Lower Carbonate-detritus, (4) Upper Dolomite, and (5) Upper Carbonate-detritus Members. The Samaria Member is the only fossiliferous unit within the Hyrum Formation.
The Beirdneau Formation …
Soils Of Nebraska, John A. Elder
Soils Of Nebraska, John A. Elder
Conservation and Survey Division
No abstract provided.
Maden Endüstri̇si̇ İçi̇n Alinacak Kararlarda Jeoloji̇ni̇n Fonksi̇yonu*, Francis Cameron
Maden Endüstri̇si̇ İçi̇n Alinacak Kararlarda Jeoloji̇ni̇n Fonksi̇yonu*, Francis Cameron
Bulletin of the Mineral Research and Exploration
No abstract provided.
Igneous Geology Of The Rio Puerco Necks, Sandoval And Valencia Counties, New Mexico., William Travis Brown Jr.
Igneous Geology Of The Rio Puerco Necks, Sandoval And Valencia Counties, New Mexico., William Travis Brown Jr.
Earth and Planetary Sciences ETDs
In the Rio Puerco valley of Valencia and Sandoval Counties, New Mexico, immediately east of Mount Taylor and its associated lava flows are a series of ten prominent and exposed basaltic rocks. These bodies consist of alkali basalts exhibiting no systematic mineralogic or compositional trends throughout the area. The alkali basalts are composed of olivine, augite, plagioclase (labradorite), and opaques in a trachytic to felty groundmass. Each neck was emplaced by means of a convection cell mechanism that allowed the surrounding Cretaceous sediments to remain undisturbed by the intrusion. Contained in the alkali basalts are ubiquitous ultramafic inclusions of lherzolite …
Kurze Erdölgeologische Kennzeichnung Von Türkisch-Thrakien, İsmet Uzkut
Kurze Erdölgeologische Kennzeichnung Von Türkisch-Thrakien, İsmet Uzkut
Bulletin of the Mineral Research and Exploration
No abstract provided.
Türki̇ye'de Petrol Arama Amaciyle Yapilan Jeoloji̇k Etütler, Kemal Lokman
Türki̇ye'de Petrol Arama Amaciyle Yapilan Jeoloji̇k Etütler, Kemal Lokman
Bulletin of the Mineral Research and Exploration
No abstract provided.
Klimageschichte Der Erde *, Hartmann Wedding
Klimageschichte Der Erde *, Hartmann Wedding
Bulletin of the Mineral Research and Exploration
No abstract provided.
Kazdağ Masi̇fi̇ni̇n Merkezi̇ Ve Güneydoğu Kesi̇mi̇ni̇n Jeoloji̇si̇*, Ergüzer Bi̇ngöl
Kazdağ Masi̇fi̇ni̇n Merkezi̇ Ve Güneydoğu Kesi̇mi̇ni̇n Jeoloji̇si̇*, Ergüzer Bi̇ngöl
Bulletin of the Mineral Research and Exploration
No abstract provided.