Geology Commons^™

Structural Geology Of Page Valley, Page County, Virginia, Tamera J. Warden

OES Theses and Dissertations

Page Valley contains folded and faulted Cambro-Ordovician rocks that were deformed during the Pennsylvanian-Permian Alleghanian Orogeny. Previous authors (Allen, 1967; Thornton, 1953; and King, 1950) have mapped "high-angle" faults and a klippe along the South Fork of the Shenandoah River west of Luray, Virginia. The southernmost fault offsets the New Market/Lincolnshire and Edinburg formations with the upthrown block to the west. Thornton suggested gravity sliding and strike-slip movement to explain normal displacements along the northernmost fault where the Edinburg Formation is in contact with overturned beds of the Beekmantown Formation. A klippe, as mapped by Allen and Thornton, lies on …

Recent Benthic Foraminifera Of Breton And Stake Islands Northern Gulf Of Mexico, Eric S. Collins

OES Theses and Dissertations

Fifty-three species of recent benthic foraminifera and thecamoebians have been documented and described from the Breton and Stake Island area, northern Gulf of Mexico, and from a core from Barataria Basin, Mississippi delta.

Cluster analysis of benthic assemblages using presence/absence and transformed abundance data reveals the presence of a marsh and shallow water marine biofacies. Based on the results of a presence/absence cluster analysis, the shallow water marine biofacies can be subdivided into a miliolid biofacies am an Ammonia beccarii/Elphidium species biofacies. Cluster analysis of transformed abundance data, however, shows that the shallow marine biofacies can be subdivided into four …

Trace Elements In Northern Virginia Middle Ordovician Carbonates: Implications For Diagenesis, Ruth Ann Strauss

OES Theses and Dissertations

Ninety-three carbonate rock samples collected from four of the major lithofacies types present in the Middle Ordovician limestone sequence of northwestern Virginia were analyzed to investigate whether the lithofacies bear the geochemical signature of the depositional and/or the diagenetic environment. Significant variations in Cr, Fe, Mg, Mn and Sr concentrations exist among the major lithofacies types. Low levels of Sr in both New Market lithofacies are indicative of an open system during diagenesis. Dissimilar Fe and Mn concentrations between these, however, reflect water chemistry differences in the depositional environment. Increasingly greater Cr, Fe, Mn, and Sr concentrations in the Lincolnshire …

Ua66/8/3 Geogram, Wku Geography & Geology

WKU Administration Documents

Newsletter created by and about the WKU Geography & Geology highlighting activities of faculty, students and alumni.

The Use Of Down-Hole Video To Evaluate Parameters Affecting Removal Of Storm Water Runoff Into A Karst Aquifer In Bowling Green, Kentucky, Philip Reeder

Masters Theses & Specialist Projects

Due to recent land use changes, runoff has greatly increased In Bowling Green, necessitating the drilling of nearly 600 drainage wells to direct storm water into the Lost River Karst Aquifer. Research was conducted to (1) differentiate areas of the city as optimal for removal of storm water runoff, (2) correlate lithologic features between wells, and (3) determine optimal depths to which new drainage wells should be drilled. This was accomplished using maximum capacity tests, correlation of lithologic features between wells and comparing void density to depth below the land surface.

It was only possible to develop general trends in …

Foraminiferal Biostratigraphy And Paleoenvironmental Analysis Of The Anahuac Formation (Late Oligocene-Early Miocene) From A Deep Well In Vermilion Parish, Louisiana, Audrey Lynne Orndorff

OES Theses and Dissertations

In the subsurface of Vermilion Parish, Louisiana, sediments from the Anahuac Formation in the #1 J. W. Steen well are assigned an Upper Oligocene-Lower Miocene age based on planktonic foraminifera. Previous age determinations for sediments from this formation elsewhere range from Middle to Late Oligocene based on the presence of larger foraminifera contained within these strata. Planktonic foraminifera in Anahuac formation sediments in the #1 J. W. Steen well permit their assignment to an established worldwide zonation scheme and indicate that the age ranges from the Globorotalia kugleri Interval Zone (Upper Oligocene) to the Catapsydrax dissimilis Zone (Lower Miocene). Benthic …

Holocene Geology And Migration Of A Low-Profile Barrier Island System, Metompkin Island, Virginia, Mark R. Byrnes

OES Theses and Dissertations

Analysis of historical shoreline position, cross-island profile change, and stratigraphic data provided a shoreline response model for low-profile barrier island systems. Historical shoreline data illustrates continuous, shore-parallel retreat between 1852 and 1957, at which time the island narrowed to a width of approximately 200 m. Between 1957 and 1981, ephemeral inlet breaching along southern Metompkin Island disrupted longshore sediment transport, increased the rate of shoreline recession, and resulted in differential rates of retreat associated with an abrupt break in backbarrier morphology. By 1981, a 400 m offset had formed at a position midway along Metompkin Island, suggesting that ephemeral inlet …

Groundwater Levels In Nebraska, 1987, Michael J. Ellis, Perry B. Wigley

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

A Geochemical Study Of The Eagle Creek Formation In The Columbia River Gorge, Oregon, Rachel Ann Carlin

Dissertations and Theses

The Early Miocene Eagle Creek Formation, a series of volcanic mudflows and debris flows, is exposed in the Columbia River Gorge about 64 kilometers east of Portland, Oregon. Eighty-seven samples were analyzed using instrumental neutron activation analysis for trace element concentrations. Eleven samples were analyzed by Dr. Peter Hooper at Washington State University using X-ray Fluorescence for major element chemistry. These data were used to determine that the Eagle Creek Formation compositionally ranges from andesite to dacite.

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.

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

Fission-Track Geochronology And Geothermometry Of Late Cretaceous-Early Tertiary Epizonal Plutons, In And Adjacent To The Lombard Thrust Fault, Southwestern Montana, Jean Talanda

Masters Theses

Thrusting occurred in the central portion of the central Montana salient where the timing of movements is somewhat obscured by the multiple deformations from Archean time to the present. The relationship of this thrusting to the associated plutons has not been established in every case. Fission-track geochronology was employed in dating several plutons associated with the Lombard thrust fault, consequently, defining a time range in which movement along the thrust occured.

Seven plutons with known structural relationships to the Lombard thrust have ages which suggest that movement along the fault occurred 73.2 +/- 6.7 Ma. Fission-track length distributions suggest that …

A Field Trip Guide To The Sue Point Fossil Coral Reef San Salvador Island, Bahamas, Brian White

Geosciences: Faculty Publications

See other Smith authored Field Trip Guides of Gerace Research Centre.

An Investigation Of A Soil Gas Sampling Technique And Its Applicability For Detecting Gaseous Pce And Tca Over An Unconfined Granular Aquifer, Timothy J. Mayotte

Masters Theses

A soil gas sampling and analytical technique was investigated to evaluate its ability and versatility for detecting chlorinated hydrocarbons in unconfined aquifers. The technique was used successfully to delineate plumes of perchloroethene (PCE), and 1,1,1-trichloroethane (TCA) contamination present in the vadose zone, and at the water table of an unconfined sand and gravel aquifer. Soil gas samples were obtained by concentrating PCE and TCA vapors diffusing from these sources onto a sorbent material. The samples were analyzed by gas chromatography. The data from the analysis of these samples were used to provide an initial estimate of the source areas, and …

A Guide To The Practical Use Of Aerial Color-Infrared Photography In Agriculture, Donald C. Rundquist, Scott A. Samson

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Estimated Use Of Water In Nebraska, 1985, Eugene K. Steele Jr.

Conservation and Survey Division: Faculty and Staff Publications

No abstract provided.

Rimforest Landslides, San Bernardino Mountains, Southern California, David L. Hanson

Loma Linda University Electronic Theses, Dissertations & Projects

The highly visible erosional scars near the crest of the San Bernardino Mountains just east of Strawberry Peak near the community of Rimforest are active landslides. From at least the 1920's to 1988 the primary activity has been mass wasting by rockfall in highly fractured quartz monzonite. Tension cracks in the adjacent area indicate that active landsliding may be spreading. Landsliding in this area had its origin most likely with the uplift of the San Bernardino Mountains and has continued with periods of active movement associated with heavy precipitation and seismic activity separated by long periods of dormancy. The geomorphology …

Geochemical Stratigraphy Of The Dooley Rhyolite Breccia And Tertiary Basalts In The Dooley Mountain Quadrangle, Oregon, David Neale Whitson

Dissertations and Theses

The Dooley Rhyolite Breccia in northeast Oregon was erupted between 12 and 16 million years ago, from central vents and linear feeder dikes within the Dooley Mountain quadrangle. The peraluminous, high-silica rhyolites of the formation were erupted over an irregular highland of eroded pre-Tertiary metamorphic rocks locally overlain by intracanyon, Eocene Clarno-type basalt flow(s). The Dooley Rhyolite Braccia is exposed in a tectonically disrupted, north-south trending graben across the Elkhorn Range. The formation is variable in thickness with maximum thickness exceeding 660 meters in the south and 600 meters in the north half of the quadrangle. Volumetrically the formation is …

The Mechanism Of Intrusion Of The Inyo Dike, Long Valley Caldera, California, Ze'ev Reches, Jonathan H. Fink

Geology Faculty Publications and Presentations

We analyze the intrusion of the 11-km-long lnyo Dike at the margins of Long Valley caldera, eastern California. The dike trends N07°W and is divided into at least three segments which are rotated by as much as 25° with respect to the main trend. The dike seems affected primarily by the regional stress field of right-lateral shear of the western United States and by the local thermal conditions of the crust; the dike seems unaffected by the preexisting caldera margins and Sierra-Nevada frontal fault system. The high heat flow in Long Valley caldera implies that crustal rocks below 3-4.5 km …

Common Characteristics Of Paired Volcanoes In Northern Central America, S. P. Halsort, William I. Rose

Department of Geological and Mining Engineering and Sciences Publications

Four pairs of active volcanoes along the northern Central American volcanic front have erupted basalt-andesite magmas that show consistent intrapair behavioral and compositional differences. These differences are found in records of volcanic activity and complete major and minor element data on over 200 samples. From northwest to southeast along the volcanic front the four volcano pairs are Cerro Quemado-Santa María, Tolimán-Atitlán, Acatenango-Fuego, and Santa Ana-Izalco. The volcano pair relations help explain compositional differences, apart from those reflecting variation in crustal thickness of about 15 km along the volcanic front, providing insight into across-arc variations and closely spaced subvolcanic plumbing systems. …

Direct Rate Measurements Of Eruption Plumes At Augustine Volcano: A Problem Of Scaling And Uncontrolled Variables, William I. Rose, Grant Heiken, Kenneth Wohletz, Dean Eppler, Sumner Barr, Theresa Miller, Raymond L. Chuan, R. B. Symonds

Department of Geological and Mining Engineering and Sciences Publications

The March–April 1986 eruption of Augustine Volcano, Alaska, provided an opportunity to directly measure the flux of gas, aerosol, and ash particles during explosive eruption. Most previous direct measurements of volcanic emission rates are on plumes from fuming volcanoes or on very small eruption clouds. Direct measurements during explosive activity are needed to understand the scale relationships between passive degassing or small eruption plumes and highly explosive events. Conditions on April 3, 1986 were ideal: high winds, clear visibility, moderate activity. Three measurements were made: 1) an airborne correlation spectrometer (Cospec) provided mass flux rates of SO₂; 2) …

Geology And Petrogenesis Of Ash-Flow Tuffs And Rhyolitic Lavas Associated With The Gila Cliff Dwellings Basin-Bursum Calder Complex, Southwestern New Mexico, Sheila June Seaman

Earth and Planetary Sciences ETDs

The Mogollon-Datil volcanic field of southwestern New Mexico was the site of extensive mid-Tertiary felsic volcanism. The Bursum caldera-Gila Cliff Dwellings basin is a volcanic complex in which stratigraphic and compositional relationships between eruptive units are controversial. Uncertainties associated with the complex include the relative ages of the two overlapping structures, the caldera of origin of ash-flow tuff which fills the Gila Cliff Dwellings basin, and the reconciliation of stratigraphic and chemical relations between volcanic units. A stratigraphic, structural, paleomagnetic, and petrologic study of six ash-flow tuff and lava units has contributed data to several problems concerning the geologic history …

Quaternary Geology And Tectonic Geomorphology Of The Pocatello Valley Area, Idaho-Utah, John D. Garr

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Pocatello Valley in southeastern Idaho and northern Utah is a structural and topographic basin bounded on all sides by mountains composed of Paleozoic platform carbonates and elastics. In the late Pleistocene it contained pluvial Lake Utaho, which, prior to 1981, was considered to have been an arm of Lake Bonneville. This study corroborates the finding of Currey (1981) that the two lakes were separate.

The Quaternary deposits examined in this study are divided into two broad groups: those that were deposited prior to the last pluvial lake cycle, and those that were deposited during and after the pluvial lake maximum, …

Petrology Of Passive Margin-Epeiric Sea Sediments: The Garden City Formation, North-Central Utah, Susan K. Morgan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Lower Ordovician Garden City Formation is part of the thick sequence of Lower Paleozoic limestones, dolostones, and minor siliciclastic sedimentary rocks of the western United States. The carbonate rocks were formed predominantly by shallow water deposition in tropical, passive-margin epeiric seas.

The Garden City Formation is composed of nine lithotypes which represent the various environments. The formation is a storm-influenced transgressive sequence which may be divided into innershelf shallow subtidal and outer-shelf deep subtidal environments separated by a skeletal accumulation. The skeletal accumulation, formed by storm initiation, was a submerged topographic high, below normal wave base. The inner shelf …

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.

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.

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.

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.

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.

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