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Geologic Studies Of Mercury By The U.S. Geological Survey

United States Geological Survey: Publications

A liquid at room temperature, mercury is a unique metal with unusual properties. Elemental mercury has long been used in thermometers because it responds to changes in temperature. In fact, mercury’s many diverse properties have made it useful for many products. Mercury is a good metallic conductor with a low electrical resistivity; it has been used in electrical products including electrical wiring and switches, fluorescent lamps, mercury batteries, and thermostats (Eisler, 1987). Mercury also is used in navigational instruments to measure changes in temperature and pressure. In the medical field, mercury is used as a component in dental fillings and …

Status Of Coral Reefs Of Little Cayman, Grand Cayman And Cayman Brac, British West Indies, In 1999 And 2000 (Part 1: Stony Corals And Algae), Carrie Manfrino, Bernhard Riegl, Jerome L. Hall, Robert Graifman

Marine & Environmental Sciences Faculty Articles

A benthic assessment of the isolated Cayman Islands was completed at 42 sites. Major changes in the reef community structure were documented by comparison with earlier studies. Acropora palmata and A. cervicornis, once abundant as shallow framework builders, were uncommon. Diseased stony corals were seen in >90% of the study sites, with the highest averages in Little Cayman, especially at Bloody Bay which is one of the most highly regulated marine parks in the Cayman Islands. The Montastraea annularis species complex accounted for two-thirds of the diseased corals which, along with other massive species, were affected largely by white-plague …

Focus Emu, September 2, 2003, Office Of Public Information

Focus EMU

No abstract provided.

Summary Of Seafloor Mapping And Benthic Sampling In 200-2000m, From North Carolina Through Florida., M. D. Arendt, C. A. Barans, G. R. Sedberry, R. F. Van Dolah, John K. Reed, S. W. Ross

Faculty Scholarship

Biological habitats and mineral resources in deep-waters should be identified, summarized into a database and their locations mapped. Comprehensive maps of deep-water resources are a prerequisite for managing these areas and their associated resources. In addition, this type of information is useful in mitigating conflicting user-group interests and protecting biodiversity. In the South Atlantic Bight (SAB), biological habitats of importance to deep-water fisheries resources include coral mounds, “live bottom” areas, rock outcroppings, man-made structures, tilefish mud bottom, and possibly mineral deposit areas such as manganese nodules and pavement sites. Congressional mandates, such as the Essential Fish Habitat (EFH) provisions of …

Structure And Petrology Of Windermere Age Intrusions In The Northern Rocky Mountains, Erik W. Burtis

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Evolution, Theology, And Method. Part 2: Scientific Method And Evolution, Fernando L. Canale

Andrews University Seminary Studies (AUSS)

No abstract provided.

The Monumental Legacy Of The Antiquities Act Of 1906, Mark Squillace

Publications

The Antiquities Act of 1906 authorizes the President of the United States "to declare by public proclamation, historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest that are situated upon [federal] lands . . . to be national monuments . . . " The law was passed during the Theodore Roosevelt administration, and Roosevelt quickly set about designating a wide range of lands and resources as national monuments, including notably, the 800,000 acre Grand Canyon National Monument. Roosevelt's expansive interpretation of the law was embraced by later presidents and ultimately by the Supreme Court. In …

Analytical Study On Flood Induced Seepage Under River Levees, Senda Ozkan

LSU Doctoral Dissertations

A common and potentially dangerous phenomenon associated with flooding is seepage under levees and the formation of sand boils. Seepage flow due to hydrostatic head gradients of floods may cause deformation of pervious layers leading to heave, piping and sand boils. Underseepage may also cause irreversible changes in the characteristics of the porous medium. A series of independent flood events may have cumulative effects on pervious layers causing sand boils to grow. Current underseepage analyses for levees are based on steady-state flow. Transient seepage flow due to rapid changes in river head may contribute to cumulative effects and cause critical …

Uncovering Strata: An Investigation Into The Graphic Innovations Of Geologist Henry T. De La Beche, Renee M. Clary

LSU Doctoral Dissertations

An historical investigation into the types of illustrations in the Golden Age of Geology (1788-1840) revealed the nature and progression of graphic representation at the dawning of geology as a science. Exhaustive sampling of geology texts published in the period of focus proceeded until saturation was achieved. Qualitative analysis and evaluation of early illustrations were accomplished with Edward R. Tufte's theory of graphic design. Hypothesis testing around a correlation coefficient revealed significance at the 99% confidence level for relationships between publication year and number of included graphics, and publication year and the graphic density of texts. Henry T. De la …

Systematics Of The Western Lyresnake (Trimorphodon Biscutatus) Complex: Implications For North And Middle American Aridland Biogeography, Thomas James Devitt

LSU Master's Theses

The Western Lyresnake (Trimorphodon biscutatus) is found generally from the desert southwestern United States southward along the pacific lowland versant of Mexico to northwestern Costa Rica. This species exhibits substantial geographic variation in size, squamation, and color pattern across its range, and as such has had an unstable taxonomic history. I investigated populations of T. biscutatus representing currently and formerly recognized forms using both morphological and molecular methods to infer the evolutionary history of this widespread, polytypic taxon. Multivariate statistical analyses (principal components and discriminant analysis) of morphological data (432 specimens, 33 characters) yielded six statistically significantly different groups, consistent …

Managing Project Uncertainty: From Variation To Chaos, Arnoud De Meyer, Christoph H. Loch, Michael T. Pich

Research Collection Lee Kong Chian School Of Business

The article cites a study finding that accurately gauging the degree of uncertainty inherent in the projects can help project managers quickly adapt to it. Researchers studied 16 projects in areas including personal-computer development, telecommunications, Internet startups, pharmaceutical development, iron-ore processing, airship development, and building construction, to examine risk management and project outcomes. They found that most managers failed to recognize that there are different types of uncertainty, each requiring a different management approach. This paper explores uncertainty-based management, which derives planning, monitoring and management style from an uncertainty profile comprising four types of uncertainty: variation, foreseen uncertainty, unforeseen uncertainty, …

Proterozoic Farwell Mountain-Lester Mountain Suture Zone, Northern Colorado : Subduction Flip And Progressive Assembly Of Arcs, Amanda Tyson

Earth and Planetary Sciences ETDs

The mechanisms by which juvenile Paleoproterozoic continental crust was derived from the mantle, accreted to southwestern Laurentia ca. 1.78-1.68 Ga, and stabilized as new continental lithosphere have been much debated. This study addresses the problem by assessing the proposed Paleoproterozoic "Farwell Mountain–Lester Mountain suture zone," a broad, complex zone of deformation that may contain the oldest accretionary structures within Paleoproterozoic crust south of the Cheyenne belt. The proposed "suture zone" is mapped in the Park Range of northern Colorado as a northeast-trending belt of imbricated tectonic slivers between ca. 1.79-1.77 Ga Green Mountain rocks to the north and ca. 1.76-1.72 …

Preserving Monumental Landscapes Under The Antiquities Act, Christine A. Klein

UF Law Faculty Publications

This Article examines the Antiquities Act, a 1906 statute that delegates authority to the President to establish national monuments on federal lands for the protection of prehistoric structures and relics. This modest statute, originally a scant one page in length, has set off a century of intermittent controversy that its drafters could not have anticipated. Although Congress probably intended that the statute merely protect archaeological ruins from looting by treasure hunters, presidents quickly began to utilize the statute to preserve large natural landscapes—ranging from President Theodore Roosevelt's establishment of the 800,000-acre Grand Canyon National Monument in 1908 to President Clinton's …

On Uncertainty, Ambiguity, And Complexity In Project Management, Michael T. Pich, Christoph H. Loch, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

This article develops a model of a project as a payoff function that depends on the state of the world and the choice of a sequence of actions. A causal mapping, which may be incompletely known by the project team, represents the impact of possible actions on the states of the world. An underlying probability space represents available information about the state of the world. Interactions among actions and states of the world determine the complexity of the payoff function. Activities are endogenous, in that they are the result of a policy that maximizes the expected project payoff.

A key …

The Lumberjack, May 08, 2002

Cal Poly Humboldt's Student Newspaper

The student newspaper of Humboldt State University.

Mesembrioxylon Obscurum, A New Combination For Araucarioxylon? Obscurum Knowlton, From The Upper Jurassic Morrison Formation, Wyoming, David A. Medlyn, William D. Tidwell

Western North American Naturalist

A reinvestigation of the type specimen of Araucarioxylon? obscurum Knowlton (1900) from the Upper Jurassic Morrison Formation in the Freezeout Hills of Wyoming has determined that this fossil should be transferred to Mesembrioxylon Seward (1919) as M. obscurum comb. nov. (Knowlton) Medlyn and Tidwell. Knowlton (1900), who was uncertain of its appropriate generic disposition, tentatively referred the wood to Araucarioxylon because it had obscure growth rings and relatively low ray height. Reexamination of Knowltons slides demonstrates that the wood has uniseriate, rarely biseriate rays, podocarpoid pitting, and diffuse axial parenchyma, none of which Knowlton mentioned. Tracheary pitting is mostly separate, …

Evolution Of A Miocene-Pliocene Low-Angle Normal-Fault System In The Southern Bannock Range, Southeast Idaho, Stephanie M. Carney

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Geologic mapping, basin analysis, and tephrochronologic analysis in the Clifton quadrangle of southeast Idaho indicates that the modern Basin-and-Range topography is only a few million years old and that the bulk of Cenozoic extension was accommodated by slip on an older low-angle normal-fault system, the Bannock detachment system. The detachment system was active between ~12 and < 4 Ma and accommodated ~50 % extension.

Cross-cutting relationships show that the master detachment fault, the Clifton fault, is the youngest low-angle normal fault of the system, was active at a low angle, and has not been rotated to a low-dip angle through time. Map patterns and relationships indicate that the …

Temporal Variation Of Seismic B-Values Beneath Northeastern Japan Island Arc, Aimin Cao, Stephen S. Gao

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Analysis of a high quality seismic catalog reveals that the average of seismic b-values in the crust beneath most part of northeastern Japan island arc decreased from 0.86 between 1984 and 1990, to 0.73 between 1991 and 1995. The two areas with the largest decrease are found to be in the same areas where the coupling between the North American and the Pacific plates is the highest, as suggested by a recent geodetic study. In the same time period, the annual seismic moment release increased by 10 times. In addition, there seems to be a corresponding increase in volcanic activities …

Geometry And Physical Properties Of The Chelungpu Fault, Taiwan, And Their Effect On Fault Rupture, Richard V. Heermance

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Rupture of the Chelungpu fault during the September 21, 1999, 7.6 M_wearthquake in Taiwan caused a 90-Jr,m-long surface rupture with variable displacement along strike. Analysis of core from two holes drilled through the fault zone, combined with geologic mapping and detailed investigation from three outcrops, define the fault geometry and physical properties of the Chelungpu fault in its northern and southern regions. In the northern region, the fault dips 45-60° east parallel to bedding and consists of a narrow (1-20 cm) core of dark-gray, sheared clay gouge at the base of a 30-50 m zone of increased fracture …

Structural And Kinematic Evolution Of Eocene-Oligocene Grasshopper Extensional Basin, Southwest Montana, Julie C. Kickham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Grasshopper basin of southwest Montana is a complex east-dipping graben containing five unconformity-bounded sequences of Tertiary sedimentary rocks. The Eocene-Oligocene basin lies within the northern Rocky Mountain Basin and Range province. Geologic mapping in five and a half 7.5 minute quadrangles indicates that at least three distinct phases of extension characterize the Cenozoic tectonic evolution of Grasshopper basin from approximately 46 Ma to < Ma.

The significant phases of extension in Grasshopper basin were phases 1 and 3. During the first phase of extension (46-27 Ma) the nonplanar Muddy-Grasshopper fault was initiated and 90% of the basin fill was deposited. At …

Distance Activism And The Arctic National Wildlife Refuge, Julie M. Raymond-Yakoubian

Political Science

The growing phenomenon of distance place attachment and distance activism can be seen in the extensive network of non-visitors involved in the protection of places like the Arctic National Wildlife Refuge in Alaska. This type of activism is not an anomaly, but rather an increasingly significant global phenomenon, which has gone largely unexamined by researchers of environmentalism, activism, wilderness, and place attachment. Distance activism encompasses the standard definition of activism, with the addition that distance activists must not have had physical contact with the natural environment for which they are being active. I argue that distance activists' actions and beliefs …

An Economic Analysis Of The Arsenic Standard On Nevada, Jill S. Dale

UNLV Theses, Dissertations, Professional Papers, and Capstones

In 2001, the arsenic standard for drinking water was lowered from 50 parts per billion to 10 parts per billion. The clean-up costs for Nevada are estimated at approximately 400 million dollars. The purpose of this project is to examine the economic impacts the State of Nevada will absorb as a result of the new regulation. Research of historical data will be the basis for the project. National data from the U.S. Environmental Protection Agency and data collected from the State of Nevada will be accompanied by comparable research data found through other sources

Fisheries Research Report No. 134, Volume 2 - Towards An Assessment Of The Natural And Human Use Impacts On The Marine Environment Of The Abrolhos Islands, C F. Chubb, F J. Webster, C J. Dibden

Fisheries Research Reports

These proceedings form the second of two public documents resulting from the project “Towards an assessment of the natural and human use impacts on the marine environment” funded by the Fisheries Research and Development Corporation (project no. 2000/166). Volume 1, a summary of existing information and assessment of current levels of human use, was presented at a Public Forum in Geraldton on July 11, 2001.

A two-day workshop was held immediately after the forum and was attended by invited representatives from professional fishing and recreational groups together with research and management experts. The issues identified in Volume 1, and those …

Observer, Central Washington University

Student Newspaper

Student newspaper for Central Washington University for February 14, 2002

Testing Of Noodle Creek Site 41js102 Jones County, Texas, J. Michael Quigg, Grant D. Smith, Audrey L. Scott, Jeffrey D. Owens

Index of Texas Archaeology: Open Access Gray Literature from the Lone Star State

Staff Archeologists from the Environmental Affairs Division of Texas Department of Transportation discovered buried cultural resources that constitute archeological site 41JS102, in June and July 2001 at the proposed location of a bridge replacement over Noodle Creek in Jones County, Texas. Shovel testing and backhoe trenching revealed cultural material at 65 cm below the surface. Following this discovery the Texas Department of Transportation made recommendations to the Texas Historical Commission to assess site 41JS 102 and they concurred. In September 2001 archeologists from the Texas Department of Transportation initiated the site assessment phase. Landowner complications halted that work before completion. …

Gis Integration Of Remote Sensing And Electrical Sounding Data For Hydrogeological Exploration

Journal of Spatial Hydrology

Interpretation of hydrogeological data frequently involves assimilating information from many sites each with a unique geographical location. Interpretation of these data requires that the spatial location be incorporated into the analysis. Geographic Information System (GIS) can be used efficiently for this purpose where hydrogeological data having different spatial identity can be analyzed objectively using different logical approaches. In the present paper GIS is used for the analysis of hydrogeological data acquired from remote sensing and surface geophysical techniques for the assessment of groundwater condition of a soft rock terrain in Midnapur District, West Bengal, India. Indian Remote Sensing (IRS-1B) LISS-II …

Hydrogeology Of The Sistema Huautla Karst Groundwater Basin Association For Mexican Cave Studies Bulletin, Vol. 9, 2002, James H. Smith Jr.

KIP Articles

Sistema Huautla, in 2002 the world’s seventh deepest cave, at 1,475 meters, is one of the most complex vertical drainage systems in the world. The focus of this research was to study the geology, karst hydrology, and speleology of the Sistema Huautla cave system. Literature review and subsequent field mapping identified the geologic formations and tectonic structures that Sistema Huautla and tributary caves are developed within. Structural geology studies within the aquifer indicate that base-level conduits in the mapped portion of the aquifer are formed along a major normal fault system called the Sistema Huautla Fault. Conduits in other sections …

Genetic Basis Of Adaptive Radiation In East African Cichlids, Richard Craig Albertson

Doctoral Dissertations

East African cichlids are a paramount example of adaptive morphological radiation. The most dramatic difference among species occurs in oral jaw design and correlates with ecological niche partitioning. Convergent evolution of trophic forms between lakes suggests a common mechanism. What combination of intrinsic and extrinsic factors constitute this mechanism still remains to be seen. The goal of this dissertation was to examine the genetic basis of shape differences between two closely related cichlid species that employ alternate modes of feeding. This was achieved through a number of independent experiments. First, I used field data to characterize the way in which …

Identification Of Surface Features Utilizing Landsat Imagery And An Evaluation Of Their Potential Association With Tectonic Features In Northwest Mississippi, James Alan Barck

Electronic Theses and Dissertations

No abstract provided.

Preserving Monumental Landscaptes Under The Antiquities Act, Christine A. Klein

Cornell Law Review

No abstract provided.