Geology Commons^™

Groundwater Levels In Nebraska, 1982, Martin S. Johnson, Darryll T. Pederson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Stratigraphy And Structure Of The Miocene "Esmeralda" Formation In Stewart Valley, Mineral County, Nevada, Benjamin L. Clausen

Loma Linda University Electronic Theses, Dissertations & Projects

The Miocene rocks of Stewart Valley, eastern Mineral County, Nevada, consist of volcanic flows and breccias and fluvio-lacustrine sedimentary rocks. They are called the Esmeralda Formation because they contain lithologies similar to those of the Esmeralda type section 100km south; however, the rocks in Stewart Valley were probably deposited in a separate local basin. The lower part of this formation contains small lacustrine claystone deposits (unit 1) that interfinger with volcanic breccias and flows (unit 2). The main fluvio-lacustrine sequence is above the flows and·is divided by the author into five units based on lithology: sandstone and claystone in unit …

Palynology And Paleoecology Of The Fossil Butte Member Of The Eocene Green River Formation In Fossil Basin, Lincoln County, Wyoming, Robert A. Cushman Jr.

Loma Linda University Electronic Theses, Dissertations & Projects

The palynoflora of the Fossil Butte Member of Green River Formation was studied to enhance our understanding of the depositional environment of ancient Fossil Lake. Forty-nine outcrop samples were collected from three measured sections representing the center, the margin, and intermediate areas of Fossil Lake. Of the 49 samples, 12 yielded a fairly well preserved palynomorph assemblage.

A late early Eocene to early middle Eocene age for the Fossil Butte palynoflora is indicated by the presence of Bombacaceae, Eucommia, Ilex, Juglans, Pistillipollenites, Platycarya, Pterocarya, Tilia, and Taxodium. Additional evidence for the early to middle Eocene age of the Fossil Butte …

An Irvingtonian Fauna From The Oldest Quaternary Alluvium In Eastern Pumpkin Creek Valley, Morrill And Banner Counties, Nebraska, R. George Corner, Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

Vertebrate fossils of Mammuthus meridionalis (Nesti) and Equus sp. cf. E. scotti Gidley occur at two sites in the capping alluvium of the highest strath terrace along the south side of Pumpkin Creek Valley, Nebraska. The presence of these two species supports the conclusion that the age of the capping sediments is probably early Irvingtonian (early Pleistocene).

Geology And Petrochemistry Of Ultramafic And Orbicular Rocks, Zuni Mountains, Cibola County, New Mexico, Ellen E. Lambert

Earth and Planetary Sciences ETDs

Field mapping, petrography, mineral and whole-rock chemistries have been completed on Precambrian ultramafic and orbicular rocks occurring in the Zuni Mountains, New Mexico. These rock types are surrounded by felsic igneous and metasedimentary rocks, including quartz-feldspar gneiss, quartz monzonite aplite, gneissic quartz monzonite and metarhyolite.

Two small orbicular rock outcrops occur along the contact between quartz-feldspar gneiss and gneissic quartz monzonite. Dark-green, hornblende-actinolite orbicules, having curving crystals of amphibole concentrically arranged about a central point, are set in a pink, quartz monzonite matrix. Many orbicules have been broken or deformed into irregular ellipsoids.

Metamorphosed ultramafic rocks, exhibiting original igneous textures, …

Sedimentation Rate Of Salt Determined By Micrometeorite Analysis, James Matthew Barnett

Masters Theses

The sedimentation rate of the A-l Evaporite of Michigan was determined by analysis of micrometeorites found as inclusions in the halite deposit. The samples were obtained from the Dow Chemical Company salt well number eight. The residue from the dissolved salt was magnetically separated and later analyzed by Particle Induced X-ray Emission (PIXE), X-ray diffraction , and microprobe techniques. The amount of extraterrestrial material was determined from the quantity of nickel present.

A sedimentation rate of .01 to .4 centimeters per year was calculated for the salt based on a constant influx rate of meteoritic material of 1 x 10 …

The Geology And Geochemistry Of The Summit Creek Molybdenum Prospect, Custer County, Idaho, Thomas Murray Hanna

Masters Theses

The Summit Creek stock, a molybdenum prospect located in the Pioneer Mountains of central Idaho, is a 46.7 m.y. old medium grained, slightly porphyritic quartz monzonite, which has intruded the late Ordovician Phi Kappa formation. Trend surface analysis shows that the stock is the product of one intrusive event. Pervasive mineral alteration usually associated with such porphyry (stockwork) molybdenum deposits is not present in this pluton, and the alteration that is present is confined to local faults and fractures.

Geochemical and petrographic evidence suggest that the pluton is a felsic differentiate from a melt which originated at a depth of …

The Geology Of Burnt Ridge Quadrangle And Vicinity Ravalli County, Montana, Randall Reichert

Masters Theses

Peltitic schist, quartzofeldspathic gneiss, and calc-silicate rocks of the Precambrian Belt Supergroup hav ebeen intruded by granatic plutons of the northeastern Idaho batholith within the vicinity of the southern Bitterroot Range, Montana. These units were mylonitized along the eastern margin of the intrusive complex, with shear surfaces presently dipping approximately 20° to the east. Rhyolitic ash flows and associated mafic to felsic dikes developed on and within the granitic-metamorphic terrance during Tertiary time. Numerous northeast- trending and northwest-trending faults and joints are present throughout the mapped region.

The following events play a major role in the geologic history: 1) amphibolite- …

Terence E. Hays's Review Of R. J. Blong's The Time Of Darkness: Local Legends And Volcanic Reality In Papua New Guinea, Terence E. Hays

Pacific Studies

No abstract provided.

Holocene Geologic History Of The Clatsop Plains Foredune Ridge Complex, David Karl Rankin

Dissertations and Theses

This research formulated a recent geologic history of the Clatsop Plains dating from 3500 years BP to present. Research consisted of geomorphic mapping, near-surface stratigraphic evaluation, carbon dating and subsurface interpretation of available data.

Bibliography Of Nebraska Geology, 1843-1976, John H. Sandy, Jay Fussell

Conservation and Survey Division: Faculty and Staff Publications

Preface

The computer brightened the 1970s considerably by giving researchers a tool for storing, retrieving and manipulating electronically sizable blocks of literary material on a single subject. which would otherwise have cost researchers years of scholarly investigation to bring together. It was in such a propitious moment mat we set out to assemble this state bibliography as an aid to scholars, researchers. scientists, teachers, writers, editors, and decision makers in the earth sciences, universities, and all levels of government.

As we collected, compiled, and checked citations for this bibliography, we relied heavily on the following standard sources that have indexed …

An Inventory Of Public, Industry, And Power-Generating Water Use In Nebraska, 1979 And 1980, Dennis R. Lawton, Cynthia L. Veys, Owen Goodenkauf

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Supplemental Water Supplies Policy Issue Study: A Contract Report For The State Water Planning And Review Process-Nebraska Natural Resources Commission.

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Formation And Zonation Of Ferruginous Bauxite Deposits Of The Chapman Quadrangle, Oregon, Richard Charles Marty

Dissertations and Theses

Two major theories have been advanced to account for the scattered distribution of ferruginous bauxite deposits. Original workers proposed that ferruginous bauxite originally developed over all exposed Columbia River Basalt in western Oregon and was subsequently removed by erosion. Studies which followed have suggested that it may be locally favorable conditions, especially of drainage, which are responsible for deposit distribution. Field mapping in the Chapman Quadrangle shows a possible correlation between a series of sheared zones, which may have improved drainage, and the distribution of ferruginous bauxite deposits. Examination of the pisolitic zone ferruginous bauxite of the Chapman Quadrangle failed …

Drainage Basin Characteristics Of The Minnesota River, Paul Fasching

Journal of the Minnesota Academy of Science

The geomorphology of the Minnesota River Basin is poorly understood, yet much of modern fluvial ecology requires this information as a prerequisite to physical, chemical, or biological studies. The purpose of this paper is to provide background descriptive geomorphological river basin data for the Minnesota River. Eleven descriptive parameters (river gradient, Form f, Shape 1, Shape 2, circularity ratio, elongation ration, stream order, bifurcation ratio, average area by order, number of lakes per order and number of lower order streams entering higher streams) were determined for the Minnesota River Basin as a whole as well as for ten subbasins. A …

Asymmetrical Distribution Of Quaternary Alluvial Fills, Pumpkin Creek Drainage Basin, Western Nebraska, Robert F. Diffendal Jr., R. George Corner

Robert F. Diffendal, Jr., Publications

A remnant alluvial fill of early Pleistocene age exposed in Pumpkin Creek Valley, Banner and Morrill counties, Nebraska, has yielded fossils of Mammuthus meridionalis (Nesti) and Equus sp. cf. E. scotti Gidley. Younger fill remnants of trunk and tributary streams allow a refinement of earlier views on the development of the Pumpkin Creek drainage basin during the Quaternary Period. Ancestral Pumpkin Creek both shifted to the north and entrenched its valley several times during the Quaternary Period leaving alluvial fills at three levels or more south of the present creek. Piracy of the headwaters of ancestral Pumpkin Creek took …

Stratigraphic Relationships Of The Tillamook Volcanics And The Cowlitz Formation In The Upper Nehalem River-Wolf Creek Area, Northwestern Oregon, Michael Keith Jackson

Dissertations and Theses

The upper Nehalem River-Wolf Creek area is located on the northeastern flank of the Tillamook Highlands in the northern Oregon Coast Range. Three rock stratigraphic units underlie the thesis area, and these units range from late Eocene to Oligocene in age.

Nebraska Mineral Operations Review, 1982, Raymond R. Burchett, Duane A. Eversoll

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

A Study Of The Diagenesis Of The Overburden Between The Badger And School Coal Seams, Dave Johnston Coal Field, Converse County, Wyoming, Rebecca K. Jaffer

Dissertations and Theses

Low pH zones in portions of the overburden at the Dave Johnston Coal Field, Converse County, Wyoming are the subject of this study. The low pH zones are restricted to limonite stained sandstones which grade downdip into normal pH gray sandstones. Changes in color, clay mineralogy, cementation and feldspar surface textures are noted between the two sandstone units. These changes appear to be the result of post depositional alteration that was responsible for oxidation of pyrite and chlorite, dissoluion of calcite, and the etching of feldspar grains. The parameters for the diagenesis fit those of uranium roll front models proposed …

Early Pennsylvanian Conodont-Ammonoid Biostratigraphy And The Witts Springs Problem, North-Central Arkansas, Mary Ann Eccher, Daniel J. Murdaugh, Wildon D. Hawkins

Journal of the Arkansas Academy of Science

The Witts Springs Formation was proposed as a lithostratigraphic unit in north-central Arkansas to include the interval from a horizon equivalent to the base of the Prairie Grove Member, Hale Formation to the top of the Bloyd Formation, of the type Morrowan Series, northwestern Arkansas. The top of the Witts Springs Formation was regarded as being unconformably succeeded by the middle Pennsylvanian Atoka Formation. Recent investigation of this unit in its type area has shown that the presumed Atokan Sandstone is actually a unit confined to the Bloyd Formation. Thus, the type section of the Witts Springs in Searcy County, …

Preliminary Geologic Map Of The Beaver Lake Mountains Quadrangle, Beaver And Millard Counties, Utah, United States Geological Survey

All U.S. Government Documents (Utah Regional Depository)

Preliminary geologic map of the Beaver Lake Mountains quadrangle. This map is preliminay and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.

Preliminary Surficial Geologic Map Of The Fisher Valley-Professor Valley Area, Southeastern Utah, United States Geological Survey

All U.S. Government Documents (Utah Regional Depository)

Preliminary surficial geologic map of the Fisher Valley-Professor Valley Area, Southeastern Utah.

Ground Water In The Southeastern Uinta Basin, Utah And Colorado, United States Geological Survey

All U.S. Government Documents (Utah Regional Depository)

The potential for developing oil-shale resources in the southeastern Uinta Basin of Utah and Colorado has created the need for information on the quantity and quality of water available in the area. This report describes the availability and chemical quality of ground water, which might provide a source or supplement of water supply for an oil-shale industry.

Ground-Water Hydrology And Projected Effects Of Ground-Water Withdrawals In The Sevier Desert, Utah, United States Geological Survey

All U.S. Government Documents (Utah Regional Depository)

The principal ground-water reservoir in the Sevier Desert is the unconsolidated basin fill. The fill has been divided generally into aquifers and confining beds, although there are no clearcut boundaries between these units--the primary aquifers are the shallow and deep artesian aquifers. Recharge to the ground-water reservoir is by infiltration of precipitation; seepage from streams, canals, reservoirs, and unconsumed irrigation water; and subsurface inflow from consolidated rocks in mountain areas and from adjoining areas. discharge is by wells, springs, seepage to the Sevier River, evapotranspiration, and subsurface outflow to adjoining areas.

Ua66/8/3 Annual Report, Wku Geography & Geology

WKU Administration Documents

Annual report of activities of the WKU department of Geography & Geology.

Interdiffusion Of K And Na In Alkali Feldspars: Homogenization Experiment, John B. Brady, Richard A. Yund

Geosciences: Faculty Publications

The rates of homogenization of coherent exsolution lamellaein cryptoperthites have been used to evaluate K-Na interdiffusion in alkali feldspars.An "average" interdiffusion coefficient (Ď) is between 2 and 4 x l0^-17 cm²/sec for a synthetic cryptoperthite at 600°C in the composition range Or₂₃-Or₅₃, and between 6 and 12 x 10^-16 cm²/sec for a natural cryptopertlite at 650°C in the composition range Or₀-Or₈₅. These values are for diffusion (801) at 1 atmosphere pressure. K-Na interdiffusion coefficients calculated from published K and Na self-diffusion coefficients and thermochemical solution data …

Diagenesis Of Miocene Biogenic Sediments In Lost Hills Oil Field, San Joaquin Basin, California, Michael A. Kruge

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

Major portions of the Miocene Monterey formation of California were deposited under low oxygen conditions, with restricted clastic influx, beneath waters with high phytoplankton productivity. The resulting diatomaceous and organic-rich sediments underwent diagenetic modification as they were buried.

A suite of core samples was collected from eight wells in the Lost Hills oil field ranging in present depth of burial between 535 and 2285 meters. In one well, the entire Monterey section was sampled. Cores taken from the remaining wells sampled the Reef Ridge and Antelope Members of the Monterey Formation at various burial depths.

Silica mineralogy was studied using …

Trace Fossils In Pleistocene Carbonate Rocks Of San Salvador, Bahamas, H. Allen Curran

Geosciences: Faculty Publications

Reprinted from: D.T. Gerace (ed.), Proceedings of 1st Symposium on Geology of Bahamas, CCFL, Bahamas Field Station, San Salvador, Bahamas

Intergranular Diffusion In Metamorphic Rocks, John B. Brady

Geosciences: Faculty Publications

Theoretical models of intergranular diffusion demonstrate that grain size and grain boundary width are the most important textural parameters influencing diffusion in metamorphic rocks. Taking diffusion in an aqueous solution as a limiting case for diffusion in the intergranular region of metamorphic rocks, it appears that the diffusivities of many species will be similar and relatively insensitive to variations in temperature and pressure over a wide range of metamorphic conditions. Observed variations in the mobility of chemical components during metamorphism may be related principally to variations in the ratio of the component density in the intergranular region to the component …

Diffusion Data For Clinopyroxenes From Homogenization And Self-Diffusion Experiment, John B. Brady, Robert H. Mccallister

Geosciences: Faculty Publications

Kinetic experiments involving the homogenization of fine-scale, coherent (001) pigeonite lamellae in a sub-calcic diopside have been used to constrain Ca-Mg interdiffusion coefficients for clinopyroxenes. At 1150°-1250°C and 25 kbar, "average" Ca-Mg effective binary interdiffusion coefficients are described by

Ď = (3.89 x l0^-7) exp(-360.87 kJ/RT) (m²/sec)

(Ď : (3.89 x l0^-3) exp(-86.25 kcal/RT) (cm²/sec))

with an uncertainty of a factor of 2. Because of the large thermodynamic effect on diffusion near a solvus, actual interdiffusion coefficients should vary by an order of magnitude or more with composition …