Browsing Department of Earth and Environmental Sciences by Issue Date
Now showing items 1-20 of 201
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Alluvial Fan Deposits of the Todos Santos Formation of Central Chiapas, Mexico
(University of Texas at Arlington Libraries, 1981-07)The Todos Santos Formation at Jerico was deposited as an alluvial fan system by high gradient, short duration ephemeral streams which transported gravel, sand, and mud northeastward through a feeder canyon which opened out ... -
Salinity, pH, Temperature, Desiccation And Hypoxia Tolerance In The Invasive Freshwater Apple Snail Pomacea insularum
(Environmental & Earth Science, 2007-08-23)Pomacea insularum is a tropical and subtropical, ampullariid, freshwater prosobranch snail that is native to slow-flowing rivers and canals in South America. It is a member of the genus, Pomacea, and, like other species ... -
Hydrogeochemical Evolution Of Arsenic Along Groundwater Flow Paths: Linking Aqueous And Solid Phase Arsenic Speciation
(Environmental & Earth Science, 2007-08-23)The central hypothesis of this Doctoral research work is that changes occurring along groundwater flow paths that accompany chemical weathering and oxidation-reduction reactions catalyze both arsenic (As) mobilization from, ... -
The Formation And Obduction Of Ophiolites Since The Late Precambrian
(Geology, 2007-08-23)Ophiolite formation and emplacement has been episodic since the Late Precambrian. This research study examines ophiolites that formed during the Cenozoic, Mesozoic, Paleozoic and Late Precambrian. The ophiolites were ... -
Statistical Analysis Of Rock Fabrics
(Geology, 2007-08-23)The main goal of the work is to present new procedures for statistical analysis of fabric data for structural geology. After an introduction to the problems of orientation analysis, discussion of different types of the ... -
Selenium Speciation Along A Groundwater Flow Path In The Carrizo Aquifer, Southeastern Texas, USA
(Geology, 2007-08-23)Selenium concentration and speciation [Se (VI), Se (IV) and Se (-II)] was determined along a flow path in the Carrizo Sand aquifer (southeastern Texas). Groundwater sampling was carried out in March 2006, from ten wells ... -
West Nile Virus Monitoring In North Central Texas And A Proposed Surveillance Model
(Environmental & Earth Science, 2007-09-17)West Nile virus monitoring among mosquito populations in Tarrant County, Texas has been ongoing for more than 4 years. Coupled with RT-PCR Testing by the North Texas Regional Laboratory, Tarrant County and the cities that ... -
Southern Illinois Paleoclimate Determined From Variations In Iron Oxide Content
(Geology, 2008-08-08)Diffuse reflectance spectroscopy was used to determine the relative abundance of the iron oxides hematite and goethite in a loess and paleosol sequence from an unglaciated area of southern Illinois. Factor analysis of ... -
Geochemical Investigation Of Tungsten In Two Groundwater Flow Systems: The Carrizo Sand Aquifer, Texas, USA, And The Aquia Aquifer, Maryland, USA
(Environmental & Earth Science, 2008-08-08)Groundwater sampled were collected from well sites located within the Carrizo Sand aquifer in Atascosa and McMullen counties in Texas, and also within the Aquia Aquifer, Maryland in the counties of Queen Anne's, Kent, and ... -
Studies of the Performance, Stability and Reliability of Various Configurations of the Activated Sludge Process at Full-Scale Municipal Wastewater Treatment Plants
(Engineering, Environmental, 2009-05-15)This research presents a performance, stability and reliability analysis of five configurations of activated sludge process, viz., conventional, contact stabilization, complete mix, extended aeration and sequencing batch ... -
Geology Of The Northwestern Apache Mountains, Southeast Culberson County, West Texas, U.S.A.
(Environmental & Earth Science, 2009-09-16)Middle Permian marine (Bell Canyon Formation) strata along the southwestern margin of the Delaware Basin in southeastern Culberson County, Texas provide excellent exposures of basinal and slope strata, useful fossils for ... -
Removal Of Butylene And Propylene Gas Using Biofiltration
(Environmental & Earth Science, 2010-03-03)Air pollutants are produced from a variety of anthropogenic activities such as food production, wastewater treatment plants, painting, industrial activities, and biomass combustion. Such pollutants are becoming a cause ... -
Seismic Inversion In Fluvial Reservoirs: Building A Geologic Model-based Inversion For The Stratton Field 3D Survey
(Geology, 2010-03-03)Seismic surveys, in particular 3-D surveys, are an important tool for imaging geologic structure in the subsurface; they are routinely applied to map structural trends and geometry to define the reservoir structure. Many ... -
On The Sensitivity Of Ocean Circulation To Arctic Freshwater Pulses During The Paleocene/Eocene Thermal Maximum
(Environmental & Earth Science, 2010-03-03)The Paleocene/Eocene Thermal Maximum (PETM) corresponds to a period characterized by extreme global warming caused by a massive carbon input into the ocean and atmosphere. Approximately 55 Ma in the early Cenozoic, evidence ... -
A Geologic Map And Stratigraphy Of Upper Guadalupian - Lower Ochoan (permian) Strata Along And East Of Fm 2185 In The Northwestern Apache Mountains Near Van Horn, West Texas
(Geology, 2010-03-03)A surface geologic map is constructed for an area of approximately four square miles east of Texas FM 2185, 35 miles northeast of Van Horn, West Texas in the northwestern part of the Apache Mountains. Middle Permian ... -
Geochemistry Of Molybdenum In The Aquia Aquifer, Maryland, USA
(Geology, 2010-03-03)The present study contributes to the understanding of controls on and behavior of molybdenum (Mo) in an aquifer, and its potential as an indicator of changing redox conditions along the groundwater flowpath. The central ... -
Fluvial Architecture And Geometry Of The Mungaroo Formation of Rankin Trend on the Northwest Shelf of Australia
(Geology, 2010-07-19)The Northwest Shelf of Australia contains many producing world class gas reservoirs with large areas remaining unexplored. The fluvio-deltaic Mungaroo Formation of Rankin Trend on the Northwest Shelf is the site of many ... -
Sedimentology, ichnology, depositional environment interpretation, and reservoir characterization in the Cotton Valley Formation Sandstone in the Amoco Grace Lowry #1, Harrison County, Texas
(Geology, 2010-07-19)The Cotton Valley formation in east Texas and north Louisiana is a proven hydrocarbon producing tight gas sand reservoir. Understanding the depositional environment, sandstone body geometries and reservoir properties are ... -
Trace Element Geochemistry In Groundwater Flow Systems
(Environmental & Earth Science, 2011-03-03)This research focuses on trace element geochemistry in three groundwater flow systems: the Carrizo Sand, the Upper Floridan, and the Aquia aquifers. The focus is threefold: (i) studying the geochemical behavior, concentrations, ... -
Verrucomicrobia: A Model Phylum To Study The Effects Of Deforestation On Microbial Diversity In Amazon Forest
(Environmental & Earth Science, 2011-03-03)The Amazon rainforest is known for having a very high diversity of plants and animals. However, it is one of the least understood ecosystems regarding microbial diversity. Microorganisms are important for the ecological ...