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Articles 1 - 30 of 44
Full-Text Articles in Physical Sciences and Mathematics
River Potholes: Modern And Ancient, Robert F. Diffendal Jr.
River Potholes: Modern And Ancient, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
A river pothole is a cylindrical, bowl-shaped, or irregular hollow that is usually deeper than wide. It is formed in the rocky bed of a stream by either the grinding action of sediment whirled around by stream eddies or the force of fast flowing water. Potholes usually have spirally grooved surfaces. Their widths and depths range from a few inches to many feet. Potholes on the floor of the Susquehanna River near Columbia, Pennsylvania, for example, are large enough to hold objects the size of a small car.
Potholes generally are formed in fairly homogeneous rock by streams that at …
Early Lake Ontogeny Following Neoglacial Ice Recession At Glacier Bay, Alaska, Daniel R. Engstrom, Sherilyn C. Fritz
Early Lake Ontogeny Following Neoglacial Ice Recession At Glacier Bay, Alaska, Daniel R. Engstrom, Sherilyn C. Fritz
Department of Earth and Atmospheric Sciences: Faculty Publications
This study explores the environmental forces controlling lake ontogeny at Glacier Bay as a model for early Holocene lake evolution in north temperate lakes worldwide. Long-term chemical and biological changes in lakes are investigated with two complementary research strategies: (1) limnological conditions are compared among 32 lakes of known age and in different stages of primary catchment succession and (2) sediment cores from these same lakes are analyzed stratigraphically for fossil diatoms to ascertain developmental trends in pH, alkalinity, algal composition, and trophic status at individual sites.
Trends in water chemistry inferred from the chronosequence approach include a progressive loss …
State Water Quality Standards Summary: Nebraska, U.S. Environmental Protection Agency
State Water Quality Standards Summary: Nebraska, U.S. Environmental Protection Agency
United States Environmental Protection Agency: Publications
This publication was prepared by Battelle under contract to the U,S. Environmental Protection Agency (Contract 68-03-3534). Secondary information sources were used to compile data presented in this document. Each State was given an opportunity to review and provide comments on a draft of this information document. In no event shall either the United States or Battelle have any responsibility or liability for any use, misuse, or reliance upon the information contained herein, nor does either warrant or otherwise represent in any way .the accuracy, adequacy, efficacy, or applicability of the contents hereof.
The reader should consult the water quality standards …
Groundwater Levels In Nebraska, 1987, Michael J. Ellis, Perry B. Wigley
Groundwater Levels In Nebraska, 1987, Michael J. Ellis, Perry B. Wigley
Conservation and Survey Division
No abstract provided.
Singleton Ranch Quadrangle, Nebraska—Banner, Kimball, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Singleton Ranch Quadrangle, Nebraska—Banner, Kimball, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Singleton Ranch Quadrangle, Nebraska—Banner, Kimball, and Cheyenne Counties
7.5 minute series (topographic), scale 1:24000
103°22'30" to 103°30'
41°22'30" to 41°30'
Toa, Ql, Qalc
June 13, 1988
Courthouse Rock Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Courthouse Rock Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 30' — 41° 37'30"
103° 00' — 103° 07'30"
Scale 1:24,000
Completed June 6, 1988
High resolution .tif file attached below as supplemental file
Estimated Use Of Water In Nebraska, 1985, Eugene K. Steele Jr.
Estimated Use Of Water In Nebraska, 1985, Eugene K. Steele Jr.
Conservation and Survey Division
No abstract provided.
A Guide To The Practical Use Of Aerial Color-Infrared Photography In Agriculture, Donald C. Rundquist, Scott A. Samson
A Guide To The Practical Use Of Aerial Color-Infrared Photography In Agriculture, Donald C. Rundquist, Scott A. Samson
Conservation and Survey Division
No abstract provided.
Redington Quadrangle, Nebraska—Banner And Morrill Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Redington Quadrangle, Nebraska—Banner And Morrill Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Redington Quadrangle, Nebraska—Banner and Morrill Counties
7.5 minute series (topographic), scale 1:24000
103°15' to 103°22'30"
41°30' to 41°37'30"
Twb, Qalc, Toa, IW, Tamch, Lower Whitney, Upper Whitney
April 5, 1988
Lisco Nw Quadrangle, Nebraska—Garden, Morrill, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Lisco Nw Quadrangle, Nebraska—Garden, Morrill, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Lisco NW Quadrangle, Nebraska—Garden, Morrill, and Cheyenne Counties
7.5 minute series (topographic), scale 1:24,000
102°37'30" to 102°45'
41°22'30" to 41°30'
March 31, 1988
Fairchild Ranch Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Fairchild Ranch Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 22'30" — 41° 30'
102° 45' — 102° 52'30"
Scale 1:24,000
Completed March 29, 1988
High resolution .tif file attached below as supplemental file
Dalton Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Dalton Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 22'30" — 41° 30'
102° 52'30" — 103° 00'
Scale 1:24,000
Completed March 28, 1988
High resolution .tif file attached below as supplemental file
Mud Springs Quadrangle, Nebraska—Morrill And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Mud Springs Quadrangle, Nebraska—Morrill And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Mud Springs Quadrangle, Nebraska—Morrill and Cheyenne Counties
7.5 minute series (topographic), scale 1:24,000
103° to 103°07'30"
41°22'30" to 41°30'
Toa (Coarse sand and cobble gravel)
March 25, 1988
Horsehead Ranch Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Horsehead Ranch Quadrangle, Morrill And Cheyenne Counties, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 22'30" — 41° 30'
103° 7'30" — 103° 15'
Scale 1:24,000
Completed March 24, 1988
High resolution .tif file attached below as supplemental file
Lawrence Fork / Potter 2 Ne Quadrangle, Nebraska—Banner, Morril, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Lawrence Fork / Potter 2 Ne Quadrangle, Nebraska—Banner, Morril, And Cheyenne Counties, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
Lawrence Fork / Potter 2 NE Quadrangle, Nebraska—Banner, Morril, and Cheyenne Counties
7.5 minute series (topographic), scale 1:24,000
103°15' to 103°22'30"
41°22'30" to 41°30'
Toa, Twb, Qalc, IW
March 1988
Hydrogeology Of Garfield And Wheeler Counties, Nebraska, Dennis R. Lawton, Robert A. Hiergesell
Hydrogeology Of Garfield And Wheeler Counties, Nebraska, Dennis R. Lawton, Robert A. Hiergesell
Conservation and Survey Division
No abstract provided.
Pliocene-Pleistocene Variations In Aragonite Content And Planktonic Oxygen-Isotope Record In Bahamian Periplatform Ooze, Hole 633a, André W. Droxler, Christopher H. Bruce, William W. Sager, David K. Watkins
Pliocene-Pleistocene Variations In Aragonite Content And Planktonic Oxygen-Isotope Record In Bahamian Periplatform Ooze, Hole 633a, André W. Droxler, Christopher H. Bruce, William W. Sager, David K. Watkins
Department of Earth and Atmospheric Sciences: Faculty Publications
Hole 633A was drilled in the southern part of Exuma Sound on the toe-of-slope of the southeastern part of Great Bahama Bank during ODP Leg 101. The top 55 m, collected as a suite of six approximately 9.5-m-long hydraulic piston cores, represents a Pliocene-Pleistocene sequence of periplatform carbonate ooze, a mixture of pelagic calcite (foraminifer and coccolith tests), some pelagic aragonite (pteropod tests), and bank-derived fine aragonite and magnesian calcite. A 1.6-m.y.-long hiatus was identified at 43.75 mbsf using calcareous nannofossil biostratigraphy and magnetostratigraphy.
The 43.75-m-thick periplatform sequence above the hiatus is a complete late Pliocene-Quaternary record of the past …
A Statistical Evaluation Of Formation Disturbance Produced By Well-Casing Installation Methods, Roger H. Morin, Denis R. Leblanc, Warren E. Teasdalea
A Statistical Evaluation Of Formation Disturbance Produced By Well-Casing Installation Methods, Roger H. Morin, Denis R. Leblanc, Warren E. Teasdalea
United States Geological Survey: Staff Publications
Water-resources investigations concerned with contaminant transport through aquifers comprised of very loose, unconsolidated sediments have shown that small-scale variations in aquifer characteristics can significantly affect solute transport and dispersion. Various sampling and borehole-logging techniques have been integrated into these studies to detect and measure detailed formation changes through casing or well screen along the length of the borehole. Commonly, measurement accuracy and resolution have been limited by a borehole environment consisting of an annulus of disturbed sediments produced by the casinginstallation method.
Continuation Of A Deep Borehole Stress Measurement Profile Near The San Andreas Fault 1. Hydraulic Fracturing Stress Measurements At Hi Vista, Mojave Desert, California, Stephen H. Hickman, Mark D. Zoback, John H. Healy
Continuation Of A Deep Borehole Stress Measurement Profile Near The San Andreas Fault 1. Hydraulic Fracturing Stress Measurements At Hi Vista, Mojave Desert, California, Stephen H. Hickman, Mark D. Zoback, John H. Healy
United States Geological Survey: Staff Publications
Hydraulic fracturing stress measurements were made in a 592-m-deep well at Hi Vista, California, 32 km from the San Andreas fault in the western Mojave Desert. The relative magnitudes of the horizontal principal stresses and the calculated overburden stress indicate that the stress regime at this site is transitional between thrust faulting and strike-slip faulting. The azimuths of the induced hydraulic fractureast Hi Vista exhibit considerable scatter, and the indicated direction of them aximum horizontal principal stress ranges from north-northeast to northwest. The measured magnitudes of the horizontal principal stresses and the horizontal deviatoric stress in this well are less …
10. Evidence For Continuous And Discontinuous Alteration In Dsdp Hole 418a Basalts And Its Significance To Natural Gamma-Ray Log Readings, Mary Anne Holmes
10. Evidence For Continuous And Discontinuous Alteration In Dsdp Hole 418a Basalts And Its Significance To Natural Gamma-Ray Log Readings, Mary Anne Holmes
Department of Earth and Atmospheric Sciences: Faculty Publications
During Ocean Drilling Program Leg 102, the Schlumberger natural gamma-ray spectrometry tool measured high potassium levels in one interval of DSDP Hole 418A basalts. Samples from that hole were examined by X-ray diffraction, SEM, and EDS analyses in order to identify mineral species responsible for the high readings. The results indicate that high K readings observed on wireline logs run in basement can be attributed to extensive low-temperature oxidative alteration resulting in formation of palagonite and K-rich clays (celadonite, potassic nontronite, and mixed-layer celadonite/ nontronite). Where these readings are accompanied by high porosity, low density, and low velocity readings, a …
Oligocene Calcareous-Nannofossil Biostratigraphy From Leg 101, Site 628, Little Bahama Bank Slope, Michael J. Moran, David K. Watkins
Oligocene Calcareous-Nannofossil Biostratigraphy From Leg 101, Site 628, Little Bahama Bank Slope, Michael J. Moran, David K. Watkins
Department of Earth and Atmospheric Sciences: Faculty Publications
Drilling at Hole 628A, Leg 101 of the Ocean Drilling Program, recovered a thick, relatively complete Oligocene section of nannofossil-foraminifer chalk and ooze. Sediments from Cores 101-628A-16H through 101-628A-29X were examined using the light microscope to provide information about biostratigraphy of calcareous nannofossils. Several authors noted a problem in distinguishing the first appearance of species within the Sphenolithus predistentus-S. ciperoensis lineage of the mid-Oligocene, particularly Sphenolithus ciperoensis, because of the gradual evolution of its members. Successful separation of species in this lineage is critical for accurately dating relative age of mid- and upper-Oligocene nannofossil sediments. Length and taper of …
Leg 101--An Overview, James A. Austin Jr., Wolfgang Schlager, Amanda A. Palmer, Paul A. Comet, André Droxler, Gregor Eberli, Eric Fourcade, Raymond Freeman-Lynde, Craig S. Fulthorpe, Gill Harwood, Gerhard Kuhn, Dawn Lavoie, Mark Leckie, Allan J. Melillo, Arthur Moore, Henry T. Mullins, Christian Ravenne, William W. Sager, Peter Swart, Joost W. Verbeek, David K. Watkins, Colin Williams
Leg 101--An Overview, James A. Austin Jr., Wolfgang Schlager, Amanda A. Palmer, Paul A. Comet, André Droxler, Gregor Eberli, Eric Fourcade, Raymond Freeman-Lynde, Craig S. Fulthorpe, Gill Harwood, Gerhard Kuhn, Dawn Lavoie, Mark Leckie, Allan J. Melillo, Arthur Moore, Henry T. Mullins, Christian Ravenne, William W. Sager, Peter Swart, Joost W. Verbeek, David K. Watkins, Colin Williams
Department of Earth and Atmospheric Sciences: Faculty Publications
During Leg 101, the inaugural leg of the Ocean Drilling Program, the JOIDES Resolution drilled 19 holes at 11 sites in the Bahamas. Grids of high-resolution seismic profiles provided information crucial for both site selection and regional stratigraphic interpretations. The first major scientific objective was to understand the long-term evolution of the bank-and-basin pattern that currently characterizes the Bahamas archipelago. Drilling and seismic surveys have indicated considerable platform expansion and retreat rather than stationary upward growth. Upbuilding in the Late Jurassic-Early Cretaceous was followed by drowning and retreat in the mid-Cretaceous and by renewed expansion in the Cenozoic. At Site …
The Cajon Pass Scientific Drilling Experiment: Overview Of Phase 1, Mark D. Zoback, Leon T. Silver, Thomas Henyey, Wayne Thatcher
The Cajon Pass Scientific Drilling Experiment: Overview Of Phase 1, Mark D. Zoback, Leon T. Silver, Thomas Henyey, Wayne Thatcher
United States Geological Survey: Staff Publications
The Cajon Pass Scientific Drilling Project is a broad, interdisciplinary experiment involving over two dozen principal scientists. Phase I of drilling, coring and down hole experimentation began Dec. 8, 1986 and ended April 2, 1987 with the hole at a depth of 2115 m, 82 m of core recovered and a wide range of down hole experiments successfully completed. In this paper we briefly outline the scientific motivation for the project and provide an overview of the scientific program. We also indicate some of the varied research areas in the earth sciences where data obtained in this experiment will provide …
Determining The Distribution Of Hydraulic Conductivity 1n A Fractured Limestone Aquifer By Simultaneous Injection And Geophysical Logging, Roger H. Morin, Alfred E. Hess, Frederick L. Paillee
Determining The Distribution Of Hydraulic Conductivity 1n A Fractured Limestone Aquifer By Simultaneous Injection And Geophysical Logging, Roger H. Morin, Alfred E. Hess, Frederick L. Paillee
United States Geological Survey: Staff Publications
i\ field technique for assessing the vertical distribution of hydraulic conductivity in an aquifer was applied to a fractured carbonate formation in southeastern Nevada. The technique combines the simultaneous usc of fluid injection and geophysical logging to measure in situ vertical distributions of fluid velocity and hydraulic head down the borehole; these data subsequently are analyzed to arrive at quantitative estimates of hydraulic conductivity across discrete intervals in the aquifer. The diagnostic capabilities of the analysis were found to be constraincd by the accuracy and resolution of the logging tools as well as by the hydraulic characteristics of the formation. …
Hydraulic Fracturing In Situ Stress Measurements To 2.1 Km Depth At Cajon Pass, California, John H. Healy, Mark D. Zoback
Hydraulic Fracturing In Situ Stress Measurements To 2.1 Km Depth At Cajon Pass, California, John H. Healy, Mark D. Zoback
United States Geological Survey: Staff Publications
Stress measurements to 2.1km reveal stress changes with depth that cannot be explained by an elastic response to uniform crustal strain. The data at about 1 km depth suggest that the stress is limited by the frictional strength of rock and is perturbed at greater depths by faults which intersect the borehole. The stress
data indicate that there is little or no right-lateral shear stress acting on planes parallel to the San Andreas Fault.
Broadwater [Se] Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Broadwater [Se] Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 30' — 41° 37'30"
102° 45' — 102° 52'30"
Scale 1:24,000
Completed [n.d.]
High resolution .tif file attached below as supplemental file
Broadwater Sw Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Broadwater Sw Quadrangle, Morrill County, Nebraska, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
7.5' topgraphic quadrangle showing exposures of bedrock formations and other geologic information.
41° 30' — 41° 37'30"
102° 52'30" — 103° 00'
Scale 1:24,000
Completed April 12, 1988
High resolution .tif file attached below as supplemental file
Nebraska Mineral Operations Review, 1987, Raymond R. Burchett
Nebraska Mineral Operations Review, 1987, Raymond R. Burchett
Conservation and Survey Division
No abstract provided.
Annual Installation Of Irrigation Wells In Nebraska Through 1988, Conservation Survey Division
Annual Installation Of Irrigation Wells In Nebraska Through 1988, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Branched Oak Lake State Recreation Area
Branched Oak Lake State Recreation Area
Conservation and Survey Division
No abstract provided.