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Recent Articles in Geomorphology
A Study Of Knickpoint Formation: Geomorphic Analysis Of San Simeon Creek, Keith Moffatt 
California Polytechnic State University
A Study Of Knickpoint Formation: Geomorphic Analysis Of San Simeon Creek, Keith Moffatt
Natural Resources Management and Environmental Sciences
The highest point of orogeny in the Santa Lucia range occurs 50-60km from the nearest active faulting. This orogeny is believed to have occurred hear due to relatively weak Franciscan Mélange versus the granitic material at the fault boundary. This paper studies the development of a knickpoint in San Simeon creek to identify the role of relatively recent (graded time) tectonic activity in orogeny of the Santa Lucia range.
The 2003 earth quake is evidence of recent base level change with the occurrence of orogeny supporting the theory of continuous orogeny in recent and graded time scale. Although the knickpoint ...
Late-Quaternary Channel Migration In Red Rock Canyon State Park, California; Implications For Regional Tectonics, Kirk Forrest Townsend California Polytechnic State University
Late-Quaternary Channel Migration In Red Rock Canyon State Park, California; Implications For Regional Tectonics, Kirk Forrest Townsend
Natural Resources Management and Environmental Sciences
The Iron Canyon Valley, located at the southern end of the eastern Sierra Nevada at the boundary between the Mojave and Basin and Range tectonic provinces, exhibits clear evidence, over graded timescales, of development through monoclinal shifting, which is the tendency of streams flowing parallel to strike over sedimentary rocks to shift down-dip. Although the character of the valley and bedrock dip indicates development through monoclinal shifting, the current stream network is located up-dip on the east side of the valley. Mapping the surficial geology of the valley revealed the presence of dissected alluvial surfaces approximately 85 meters above modern ...
Using Gis To Delineate Headwater Stream Origins In The Appalachian Coal-Belt Region Of Kentucky, Jonathan A. Villines 
University of Kentucky
Using Gis To Delineate Headwater Stream Origins In The Appalachian Coal-Belt Region Of Kentucky, Jonathan A. Villines
Theses and Dissertations--Biosystems and Agricultural Engineering
Human activity such as surface mining can have substantial impacts on the natural environment. Performing a Cumulative Hydrologic Impact Assessment (CHIA) of such impacts on surface water systems requires knowing the location and extent of these impacted streams. The Jurisdictional Determination (JD) of a stream’s protected status under the Clean Water Act (CWA) involves locating and classifying streams according to their flow regime: ephemeral, intermittent, or perennial. Due to their often remote locations and small size, taking a field inventory of headwater streams for surface mining permit applications or permit reviews is challenging. A means of estimating headwater stream ...
Comparison Of Topographic Surveying Techniques In Streams, Sara G. Bangen 
Utah State University
Comparison Of Topographic Surveying Techniques In Streams, Sara G. Bangen
All Graduate Theses and Dissertations
Fine-scale resolution digital elevation models (DEMs) created from data collected using high precision instruments have become ubiquitous in fluvial geomorphology. They permit a diverse range of spatially explicit analyses including hydraulic modeling, habitat modeling and geomorphic change detection. Yet, the intercomparison of survey technologies across a diverse range of wadeable stream habitats has not yet been examined. Additionally, we lack an understanding regarding the precision of DEMs derived from ground-based surveys conducted by different, and inherently subjective, observers. This thesis addresses current knowledge gaps with the objectives i) to intercompare survey techniques for characterizing instream topography, and ii) to characterize ...
Applications Of Bayesian Statistics In Fluvial Bed Load Transport, Mark L. Schmelter Utah State University
Applications Of Bayesian Statistics In Fluvial Bed Load Transport, Mark L. Schmelter
All Graduate Theses and Dissertations
Fluvial sediment transport is a process that has long been important in managing water resources. While we intuitively recognize that increased flow amounts to increased sediment discharge, there is still significant uncertainty in the details. Because sediment transport---and in the context of this dissertation, bed load transport---is a strongly nonlinear process that is usually modeled using empirical or semi-empirical equations, there exists a large amount of uncertainty around model parameters, predictions, and model suitability. The focus of this dissertation is to develop and demonstrate a series of physically- and statistically-based sediment transport models that build on the scientific knowledge of ...
Testing A Novel Technique To Improve Aluminum-26 Accelerator Mass Spectrometry Measurements For Earth Science Applications, Meghan Sarah Janzen 
University of Tennessee, Knoxville
Testing A Novel Technique To Improve Aluminum-26 Accelerator Mass Spectrometry Measurements For Earth Science Applications, Meghan Sarah Janzen
Masters Theses
The measurement of cosmogenic 26Al [aluminum-26] in geological samples by accelerator mass spectrometry (AMS) is typically conducted on Al2O3 [aluminum oxide] targets. However, Al2O3 is not an ideal source material because it does not form a prolific beam of Al- [negative atomic aluminum ions] required for measuring low-levels of 26Al. This thesis presents the performance of AlN [aluminum nitride], AlF3 [aluminum fluoride] and mixed AlN + Al2O3 as novel alternative source materials for the analysis of 26Al. A negative ion cesium sputtering source at the Holifield Radioactive Ion ...
A Multispectral Assessment Of Complex Impact Craters On The Lunar Farside, Bhairavi Shankar 
Western University
A Multispectral Assessment Of Complex Impact Craters On The Lunar Farside, Bhairavi Shankar
University of Western Ontario - Electronic Thesis and Dissertation Repository
Hypervelocity collisions of asteroids onto planetary bodies have catastrophic effects on the target rocks through the process of shock metamorphism. The resulting features, impact craters, are circular depressions with a sharp rim surrounded by an ejecta blanket of variably shocked rocks. With increasing impact energy, the inner crater cavity can preserve complex morphologies including terraced walls, central uplifts, and melted rocks. The lack of erosion due to the absence of water or an atmosphere makes the Moon the perfect target to study impact crater processes, in particular the distribution of highly shocked materials within impact craters of different sizes. This ...
Appropriate Terminology For Karst-Like Phenomena: The Problem With ‘Pseudokarst’, Rolan S. Eberhard, Chris Sharples 
University of South Florida
Appropriate Terminology For Karst-Like Phenomena: The Problem With ‘Pseudokarst’, Rolan S. Eberhard, Chris Sharples
International Journal of Speleology
The practice of referring to certain morphologically karst-like phenomena as ‘pseudokarst’ is problematic, because it ignores basic principles of sound classification, logical naming conventions and accepted geomorphic classifications and terminology. These problems have compounded the difficulty in establishing an accepted classification of ‘pseudokarst’ types. The practice embodies a karst-centric perspective which should be avoided in favour of using conventional geomorphic terminology for non-karstic features. We illustrate this by providing existing conventional terms for many ‘pseudokarst’ types reported in the literature.
The Periglacial Landscape Of Utopia Planitia; Geologic Evidence For Recent Climate Change On Mars., Mary C. Kerrigan Western University
The Periglacial Landscape Of Utopia Planitia; Geologic Evidence For Recent Climate Change On Mars., Mary C. Kerrigan
Electronic Thesis and Dissertation Repository
The northern plains of Utopia Planitia, Mars, hosts an abundance of potential periglacial landforms including scalloped depressions, gullies, and polygon networks. This research was undertaken to investigate the distribution and stratigraphy of scalloped depressions in Utopia Planitia and to reconstruct the past environment in which this periglacial landscape formed. To that end, a revised geologic map of the region has been produced. We define, for the first time, a new Periglacial Unit, the youngest geologic unit in Utopia Planitia. We have also developed a model for the formation and evolution of the periglacial landscape examined by assessing the use of ...
Modeling Bedrock Mining Hotspots Within The Ouachita National Forest, Arkansas, Stephanie H. Mehlhope University of Kentucky
Modeling Bedrock Mining Hotspots Within The Ouachita National Forest, Arkansas, Stephanie H. Mehlhope
Theses and Dissertations--Geography
This study, concentrating on the Ouachita Mountain Range in western-central Arkansas, extends prior work on treethrows and their influence on soil development in the region by supplying a method of determining hotspots of bedrock mining by treethrow. Binary logistic regression analysis was employed to determine the abiotic and biotic factors that are highly correlated with the rate of bedrock detachment found in uprooted rootwads from three study sites within the Ouachita National Forest. The produced logistic regression models suggest topographic factors, tree specific characteristics, as well as the local geology and soil characteristics all have a significant effect upon the ...
Natural And Anthropogenic Factors Which Influence Aerosol Distribution In Ingleborough Show Cave, Uk, Andrew C. Smith B.S.C, Peter M. Wynn, Philip A. Barker Professor University of South Florida
Natural And Anthropogenic Factors Which Influence Aerosol Distribution In Ingleborough Show Cave, Uk, Andrew C. Smith B.S.C, Peter M. Wynn, Philip A. Barker Professor
International Journal of Speleology
Monitoring in Ingleborough Show Cave (N. Yorkshire, UK) reveals the influence of tourism and cave management techniques on different parameters of the cave atmosphere. Exploratory aerosol monitoring identified a 0.015 ± 0.03 mg/m³ (≈70%) reduction in airborne particulates within the first 75 meters of cave passage and two major aerosol sources within this artificially ventilated show cave. Autogenic aerosol production was identified close to active stream ways (increases of
Deformation In Fossil And Active Convergent Tectonic Regions: Examples From Sudbury, Ontario, And Rhodes, Greece, Martin D. Clark 
McMaster University
Deformation In Fossil And Active Convergent Tectonic Regions: Examples From Sudbury, Ontario, And Rhodes, Greece, Martin D. Clark
Open Access Dissertations and Theses
The kinematics and associated deformation of upper crust in fossil and active convergent tectonic settings require different methods of study. In this thesis, I analyzed an example of a fossil convergent setting, the formation of the eastern portion of Paleoproterozoic Sudbury Basin, Ontario, and an example of an active convergent plate interface represented by the ongoing subduction along the Hellenic Arc at Rhodes, Greece. In Sudbury, using paleomagnetic remanence directions and Matachewan dyke orientations, I constrain the magnitudes of rotation associated with the formation of the NE-lobe, a tight secondary fold of the Sudbury Basin, as well as localize the ...
Cryogenic Fracturing Of Calcite Flowstone In Caves: Theoretical Considerations And Field Observations In Kents Cavern, Devon, Uk., Joyce Lundberg, Donald A. McFarlane University of South Florida
Cryogenic Fracturing Of Calcite Flowstone In Caves: Theoretical Considerations And Field Observations In Kents Cavern, Devon, Uk., Joyce Lundberg, Donald A. Mcfarlane
International Journal of Speleology
Several caves in Devon, England, have been noted for extensive cracking of substantial flowstone floors. Conjectural explanations have included earthquake damage, local shock damage from collapsing cave passages, hydraulic pressure, and cryogenic processes. Here we present a theoretical model to demonstrate that frost-heaving and fracture of flowstone floors that overlie wet sediments is both a feasible and likely consequence of unidirectional air flow or cold-air ponding in caves, and argue that this is the most likely mechanism for flowstone cracking in caves located in Pleistocene periglacial environments outside of tectonically active regions. Modeled parameters for a main passage in Kents ...
A Large Cervidae Holocene Accumulation In Eastern Brazil: An Example Of Extreme Taphonomical Control In A Cave Environment, Alex Hubbe, Augusto S. Auler University of South Florida
A Large Cervidae Holocene Accumulation In Eastern Brazil: An Example Of Extreme Taphonomical Control In A Cave Environment, Alex Hubbe, Augusto S. Auler
International Journal of Speleology
A remarkable cervid bone accumulation occurs at a single passage (named Cervid Passage; CP) at Lapa Nova, a maze cave in eastern Brazil. CP lies away from cave entrances, is a typical pitfall passage and contains bone remains of at least 121 cervids, besides few bats, peccaries and rodents remains. There is no evidence of water (or sediment) flow at the site and in general bones lack post depositional alterations and display anatomical proximity, suggesting that the majority of the remains found inside CP (mainly cervids) are due to animals that after entering the cave got trapped in the site ...
Popular Institutions
Popular Authors
Chris Sharples
University of South Florida
Rolan Eberhard
University of South Florida
Michal Filippi
University of South Florida
Christoph Spötl
University of South Florida
Sandro Galdenzi
University of South Florida
James McCalpin
University of Nebraska - Lincoln
Caroline Burberry
University of Nebraska - Lincoln
John Cosgrove
University of Nebraska - Lincoln
Andrew Smith
University of South Florida
Philip Barker
University of South Florida
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Popular Articles
Appropriate Terminology For Karst-Like Phenomena: The Problem With ‘Pseudokarst’, Rolan Eberhard, Chris Sharples
Secondary Halite Deposits In The Iranian Salt Karst: General Description And Origin, Michal Filippi
Scientific Drilling Of Speleothems – A Technical Note, Christoph Spötl
Corrosion Of Limestone Tablets In Sulfidic Ground-Water: Measurements And Speleogenetic Implications, Sandro Galdenzi
A Study Of Fold Characteristics And Deformation Style Using The Evolution Of The Land Surface: Zagros Simply Folded Belt, Iran, Caroline Burberry, John Cosgrove
Natural And Anthropogenic Factors Which Influence Aerosol Distribution In Ingleborough Show Cave, Uk, Andrew Smith, Peter Wynn, Philip Barker
The First Cave Occurrence Of Orpiment (As₂S₃) From The Sulfuric Acid Caves Of Aghia Paraskevi (Kassandra Peninsula, N. Greece), Vasilios Melfos, Georgios Lazaridis
Evolution Of The Cretaceous Calcareous Nanofossil Genus Eiffellithus And Its Biostratigraphic Significance, David Watkins, Jamie Shamrock
A Multispectral Assessment Of Complex Impact Craters On The Lunar Farside, Bhairavi Shankar
Based on downloads this month