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Geology

2013

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Articles 421 - 432 of 432

Full-Text Articles in Physical Sciences and Mathematics

The Magnitude, Timing And Abruptness Of Changes In North African Dust Deposition Over The Last 20,000 Years, D. Mcgee, P. Demenocal, G. Winckler, J. Stuut, Louisa Bradtmiller Dec 2012

The Magnitude, Timing And Abruptness Of Changes In North African Dust Deposition Over The Last 20,000 Years, D. Mcgee, P. Demenocal, G. Winckler, J. Stuut, Louisa Bradtmiller

Louisa I. Bradtmiller

No abstract provided.


The “Curse Of Rafinesquina:” Negative Taphonomic Feedback Exerted By Strophomenid Shells On Storm-Buried Lingulids In The Cincinnatian Series (Katian, Ordovician) Of Ohio, Rebecca Freeman, Benjamin Dattilo, Aaron Morse, Michael Blair, Steve Felton, John Pojeta Dec 2012

The “Curse Of Rafinesquina:” Negative Taphonomic Feedback Exerted By Strophomenid Shells On Storm-Buried Lingulids In The Cincinnatian Series (Katian, Ordovician) Of Ohio, Rebecca Freeman, Benjamin Dattilo, Aaron Morse, Michael Blair, Steve Felton, John Pojeta

Benjamin F. Dattilo

Taphonomic feedback is the idea that accumulation of organic remains either enhances the habitat for some organisms (positive taphonomic feedback), and/or degrades the habitat for others (negative taphonomic feedback). Examples of epibionts living on skeletal remains are direct evidence of positive taphonomic feedback. Disruption of infaunal burrowing activities by skeletal fragments is an example of negative taphonomic feedback; direct fossil evidence of this phenomenon has not been documented previously. Infaunal organisms are vulnerable to exhumation or entombment during storms, but organisms that burrow can also re-establish viable life positions subsequently. For example, when modern lingulids re-burrow after exhumation, they first …


Introduction And Tribute, George Voulgaris, Timothy Kana, Jacqueline Mitchell Dec 2012

Introduction And Tribute, George Voulgaris, Timothy Kana, Jacqueline Mitchell

George Voulgaris

No abstract provided.


Detrital Zircon Provenance Of The Mesoproterozoic Midcontinent Rift, Lake Superior Region, Usa: Journal Of Geology, V. 121, P. 57-73., John Craddock, Alex Konstantinou, Jeffrey Vervoort, Karl Wirth, Cam Davidson, Lee Finley-Blasi, Natalie Juda, Erin Walker Dec 2012

Detrital Zircon Provenance Of The Mesoproterozoic Midcontinent Rift, Lake Superior Region, Usa: Journal Of Geology, V. 121, P. 57-73., John Craddock, Alex Konstantinou, Jeffrey Vervoort, Karl Wirth, Cam Davidson, Lee Finley-Blasi, Natalie Juda, Erin Walker

Karl Wirth

No abstract provided.


Appendix A: Borehole Data (Thesis Appendix, 2013), David J. Richey Dec 2012

Appendix A: Borehole Data (Thesis Appendix, 2013), David J. Richey

David J Richey

Select borehole data compiled and organized from Utah Division Oil, Gas and Mining (www.oilgas.ogm.utah.gov). The data found here include API well numbers, names of all wells used, well datum as defined by the elevation above sea level measured at the Kelly Bushing on the drilling floor, and the depth to various formation tops encountered during drilling measured in drilling depth.


Appendix B: Geophysical Data (Thesis Appendix, 2013), David J. Richey Dec 2012

Appendix B: Geophysical Data (Thesis Appendix, 2013), David J. Richey

David J Richey

Select geophysical data collected and processed during this thesis. A description of the geophysical methods used, the results and raw data, and some interpretations are provided in this appendix.


Selected Drillhole Data (Dogm), Emery County, Ut, David J. Richey Dec 2012

Selected Drillhole Data (Dogm), Emery County, Ut, David J. Richey

David J Richey

Compiled formation tops data for selected oil and gas exploration drill holes in Emery County, Utah. Data was downloaded from [http://oilgas.ogm.utah.gov/index.htm].


Reversible Water Weakening Of Quartz, Caleb Holyoke, Andreas Kronenberg Dec 2012

Reversible Water Weakening Of Quartz, Caleb Holyoke, Andreas Kronenberg

Caleb Holyoke

No abstract provided.


High Pressure Deformation Experiments Using Solid Confining Media And Griggs Piston-Cylinder Methods: Appraisal Of Stress And Deformation In Talc Assemblies, Eric Stewart, Caleb Holyoke, Andreas Kronenberg Dec 2012

High Pressure Deformation Experiments Using Solid Confining Media And Griggs Piston-Cylinder Methods: Appraisal Of Stress And Deformation In Talc Assemblies, Eric Stewart, Caleb Holyoke, Andreas Kronenberg

Caleb Holyoke

No abstract provided.


Dislocation Creep Of Polycrystalline Dolomite, Caleb Holyoke, Andreas Kronenberg, Julie Newman Dec 2012

Dislocation Creep Of Polycrystalline Dolomite, Caleb Holyoke, Andreas Kronenberg, Julie Newman

Caleb Holyoke

No abstract provided.


Hydrolytic Weakening Of Olivine At Mantle Pressure: Evidence Of [100](010) Slip System Softening From Single-Crystal Deformation Experiments, Jennifer Girard, Jiuhua Chen, Paul Raterron, Caleb Holyoke Dec 2012

Hydrolytic Weakening Of Olivine At Mantle Pressure: Evidence Of [100](010) Slip System Softening From Single-Crystal Deformation Experiments, Jennifer Girard, Jiuhua Chen, Paul Raterron, Caleb Holyoke

Caleb Holyoke

No abstract provided.


Bedrock Strength And River Metrics: Spatial And Statistical Correlations On The Incision Of The Colorado Plateau, Southwest Usa, Natalie Bursztyn, Joel Pederson Dec 2012

Bedrock Strength And River Metrics: Spatial And Statistical Correlations On The Incision Of The Colorado Plateau, Southwest Usa, Natalie Bursztyn, Joel Pederson

Natalie Bursztyn

There has been renewed debate over the mechanisms and timing of both uplift and erosion in the Colorado Plateau. Yet, in order to understand the patterns of topography and surficial processes in this landscape a third factor of bedrock properties must be considered. We are building a dataset of bedrock strength and exploring it in the context of topographic metrics. Included are rock-strength measures such as Schmidt-hammer compressive strength, Selby rock-mass strength, and laboratory tensile strength measures. To estimate the strength of units too incompetent to test directly, such as the shales prevalent in the region, we utilize functional relations …