Geology Commons^™

The Lund Ash-Flow Tuff, John Evans Kreider

Masters Theses

"The Lund Ash-flow Tuff is the uppermost member of the Needles Range Formation, located in southwestern Utah and eastern Nevada. This member can be correlated over an area of several thousand square miles. A detailed study of petrographic and physical features of the Lund show vertical and lateral variations in mineral content and welding intensity. Vertical differences are related to changes in the magma chamber during the Lund eruption interval. Several different ash-flows make up the Lund member. All mineral concentrations vary laterally, with concentration decreasing away from the center of the Lund field. Vertical and lateral variations in physical …

The Stratigraphic Framework Of Pleistocene Glacial And Periglacial Deposits In The Central Plains, V. H. Dreeszen

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Nebraska Groundwater Level (Decline & Rise), 1970

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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. …

Paleoenvironmental Reconstruction Of Late Quaternary Lacustrine Sediments (Seibold Site) In Southeastern North Dakota, William B. Bickley Jr.

Theses and Dissertations

The Seibold Site on the Missouri Coteau in northwest Stutsman County, North Dakota, contains a late Quaternary lacustrine deposit with a spectaculary preserved and diverse biota; more than 150 species occur, of which the mollusks and fish are figured and discussed in detail in this study. The stratigraphic sequence, in ascending order, is a follows: 1) pebbly silt; 2) clayey silt; 3) organic mud; 4) calcareous mud; 5) sandy silt and clay; 6) silty sand; and 7) sandy silt and clay.

The stratigraphic sequence and biota suggest a 5-phase history for the area during the last 11,000 years. During phase …

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. …

Quaternary Geology Of Rolette County, North Dakota, Dwight E. Deal

Theses and Dissertations

Rolette County contains approximately 942 square miles in north central North Dakota (Tps. 159-164 N., Rs. 69-73 W.) adjacent to the Canadian border. It includes the southeastern part of the Turtle Mountains and part of the glacial Lake Souris basin. Basic lithologies recognized in the surface sediments were bedded clay, silt, sand, and gravel; and three types of non-bedded diamicton. These were combined and, with bedding characteristics and organic content, formed 15 practical field mapping units. Geologically significant scarps and hill slopes were also mapped. The data collected is shown at a scale of 1 inch to 2 miles. The …

Groundwater Flow In Part Of The Little Missouri River Basin, North Dakota, Thomas M. Hamilton

Theses and Dissertations

The Little Missouri valley in western North Dakota is deeply incised into slightly permeable Mesozoic and Cenozoic sediments. An evaluation of the groundwater flow in part of this valley was 'based on the present groundwater flow-system models. Abrupt changes in the hydrochemical facies have been explained relative to a continuous flow system.

The Little Missouri valley ls the discharge area of a regional groundwater flow system; it affects the potential distribution of the flow system for a minimum of 1.000 feet below the valley floor. The discharge area is approximately the same width as the valley floor and has a …

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 …

Petrology And Diagenesis Of The Cyclic Maquoketa Formation (Upper Ordovician) Pike County, Missouri, Edwin Carl Kettenbrink Jr.

Masters Theses

"The Maquoketa Formation (Upper Ordovician-Cincinnatian Series) has been extensively studied for over one hundred years, but a petrographic study of its cyclic lithologies has been neglected. The following six distinct Maquoketa lithologies have been recognized in this study in Pike County, Missouri: 1) phosphatic biosparite, 2) phosphorite, 3) micrite-microsparite, 4) dolomitic shale, 5) dolomitic marlstone, and 6) dolomitic quartz siltstone. Three cycle types are present in the Maquoketa. They are expressed as thin beds (1-20 inches) of alternating micrite-shale, micrite-marlstone, and shale-siltstone. Contacts between different lithologies are sharp, indicating a primary sedimentological origin for the cycles. Precisely what mechanism was …

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 …

Textural Properties, Provenance, And Environments Of Formation Of The "Rimrock" Sandstone Of The Filled Sinkholes Northeast Of Rolla, Missouri, Upendra Jayantilal Parikh

Masters Theses

"Filled sinkholes have long been known to occur in the carbonate rocks of Missouri. A sandstone unit occurs in these sinkholes at their outer margin, forming a rim, and is called here the rimrock sandstone. Samples of rimrock sandstone, from an area northeast of Rolla, Missouri were studied. Grain size, heavy mineral and. thin section analyses of these samples were carried out. Size analysis data suggest that, texturally, the rimrock sandstone is similar to the St. Peter sandstone and that this formation could have supplied sands for the formation of rimrock. Field evidences suggest that continental conditions prevailed at the …

Occurrence Of Gypsum In The Johnson Shale (Permian) In Nemaha County, Nebraska, R. R. Burchett

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Total Number Of Irrigation Wells Located In Nebraska Counties As Of 1970

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Distribution And Subdivision Of Precambrian And Lower And Middle Paleozoic Rocks In The Subsurface Of Nebraska, M. P. Carlson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Surficial Lineaments And Their Structural Implications In The Williston Basin, A. Kirth Erickson

Theses and Dissertations

Lineaments of apparent geostructural origin are observable on air photos of the Williston basin. The pattern formed by these lineaments has the appearance of a broad system of interconnecting wrench faults such as occur on the adjacent Canadian shield. On this basis it is hypothesized that a broad system of left-lateral wrench faults may underlie the Williston basin region and possibly the entire continental foreland structural province.

Structures in the Williston basin are readily adaptable to this interpretation. The Nessen anticline appears to consist of a north-south realignment of a N. 40° E.- trending Precambrian high which was segmented by …

Upper Cretaceous And Lower Cenozoic Foraminifera Of Three Oil Wells In Northwestern Iraq, Farouk Sunallah Al-Omari

Doctoral Dissertations

"Seventy-five samples of well cuttings and cores from the Iraq Petroleum Company Butmah Well No. 9, Ain Zalah Well No. 16 and Ain Zalah Well No. 17, in northwestern Iraq at approximately 36° 37' north latitude and 42° 41' east longitude, have been examined in detail. The lithologic descriptive term "marl" is replaced by calcareous shale or argillaceous limestone, and the term "globigerinal limestone" is not considered applicable. The foraminiferal fauna from the upper part of the Shiranish Formation prove to be of Maestrichtian age. The Mesozoic-Cenozoic boundary is recognized on the basis of "smaller foraminiferal" faunal assemblages; it is …

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

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

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 /

Stratigraphic Analysis Of The Upper Permian And Lower Triassic Strata In Southern Utah, Charles Dennis Irwin Jr.

Earth and Planetary Sciences ETDs

Permian sedimentation in southwestern Utah was influenced by three principal depositional areas. These areas were the Oquirrh basin in north-central Utah, the Cordilleran geosyncline in eastern Nevada, and the Quemado-Cuchillo basin on the northern shelf of the Sonoran geosyncline in east-central Arizona and west-central New Mexico. Throughout Permian time, marine sediments and their well-developed beach and continental eolian sandstone equivalents were deposited within these basins and upon their surrounding shelves. Each of the three basins appear to have exerted their influence upon sedimentation during a discrete period of geologic time. Thus while one basin was sedimentationally active the other two …

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

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

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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

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 …

Soils Of Nebraska, John A. Elder

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

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 …

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 …

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 …