Stratigraphy Commons^™

Conodont Biostratigraphy Of The Cambrian-Ordovician Boundary Interval In The Northern Shenandoah Valley Of Virginia, U.S.A., Randall C. Orndorff

OES Theses and Dissertations

Conodonts collected from two measured sections in the northern Shenandoah Valley of Virginia indicate that locally the Cambrian-Ordovician boundary is within the upper part of the Conococheague Formation and that the Conococheague-Stonehenge formational contact as defined in this study, is diachronous in relation to the boundary. Using the generally accepted definition of the CambrianOrdovician boundary as at the base of the trilobite Missisguoia Zone or within the conodont Hirsutodontus hirsutus Subzone of the Cordylodus proavus Zone, it is found here that the boundary is 230 ft (70 m) below the formational contact at the Narrow Passage Creek section. Several North …

The Age And Lithostratigraphic Characteristics Of Kumluca Zone, Alakirçay Group; Sw Antalya, Turkey, Mustafa Şenel

Bulletin of the Mineral Research and Exploration

No abstract provided.

The Amphibians And Reptiles Of Nebraska, George E. Hudson

Conservation and Survey Division

No abstract provided.

Groundwater Levels In Nebraska 1984, Michael J. Ellis, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.

Overview Of Nebraska And The Regional Aquifer From Proceedings Of The 1985 Water Resources Seminar Series, Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

During each spring semester, the Nebraska Water Resources Center sponsors a Water Resources Seminar Series at the University of Nebraska-Lincoln. The 1985 seminar series was entitled "Aspects of Groundwater Quality." This article appeared in the proceedings.

Groundwater Levels In Nebraska, 1984, Michael J. Ellis, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.

Aspects Of Groundwater Quality Proceedings 1985 Water Resources Seminar Series

Conservation and Survey Division

During each spring semester, the Nebraska Water Resources Center sponsors a Water Resources Seminar Series at the University of Nebraska - Lincoln. The 1985 seminar series was entitled "Aspects of Groundwater Quality".

Middle Miocene To Recent Stratigraphy And Paleogeography Of Western Nebraska, James B. Swinehart, Vernon L. Souders, H. M. Degraw, Robert F. Diffendal Jr.

School of Natural Resources: Faculty Publications

Two generally distinctive suites of sediments occur in western Nebraska, one dominantly volcaniclastic in origin deposited from the Oligocene through Early Miocene, and the other mainly epiclastic in origin deposited from the Middle Miocene through the Holocene. We have combined the epiclastic deposits usually placed in the Hemingford and Ogallala groups into an expanded Ogallala Group and have abandoned the member subdivisions of the Broadwater Formation.

New Evidence Supporting The Blancan Age Of The Sand And Gravel Sequence Capping The Ash Hollow Formation, Garden, Keith, And Lincoln Counties, Nebraska, Robert F. Diffendal Jr., James W. Goeke, Michael R. Voorhies

School of Natural Resources: Faculty Publications

Sandwiched between the overlying eolian Quaternary loesses and sands and the underlying beds of the Ash Hollow Formation, Ogallala Group, buried beneath the sliver of Cheyenne Tableland in Keith County and adjacent areas of western Nebraska, is a mass of fluvially deposited sand, gravelly sand, and sandy gravel of previously uncertain age. Some authors assigned these sediments to the Ogallala Group, while others have called them either the Broadwater Formation (Blancan), or a combination of the two rock units.

A Numerical Approach For Determining The Variable Ascent Velocity Of A Granitoid Diapir, Keith I. Mahon

Geology Theses and Dissertations

A mathematical model for granitoid diapirism has been developed that accounts for the time dependent thermal and rheological conditions encountered by the intruding body. This model is derived by the simultaneous solution of the partial differential equations of energy, continuity, and momentum utilizing scaling analysis. The underlying assumption is that deformation of the surrounding country rock is confined to a relatively thin layer with a temperature dependent Newtonian viscosity. When the country rock is modeled as a power-law fluid, the effective viscosity is dependent upon temperature and shear strain rate.
This model allows for realistic temperature gradients within the crust …

Quaternary Geology And Soils Of Mower County, Minnesota, Gerald M. Mccormick

Journal of the Minnesota Academy of Science

A complex series of sediments of diverse properties and origin make up the surface material~ of Mower County, Minnesota. The higher ridges are composed primarily of pre-Wisconsinan tills. Intermediate elevations have layers of Wisconsinan pedisediments overlying the till. In some moderately low elevation areas weathered limestone is near the surface along streams, and Wisconsinan till occurs along the west edge of the county. Outwash plains and stream terraces occur at the lowest elevations along most rivers and streams. Pre-Wisconsinan paleosols are common in some areas. A thin mantle of Wisconsinan loess covers all of the sediments.

Nebraska Mineral Operations Review, 1984, Raymond R. Burchett, Duane A. Eversoll

Conservation and Survey Division

No abstract provided.

Annual Outflow Of Water From Nebraska, 1950-1984, Conservation Survey Division

Conservation and Survey Division

No abstract provided.

Irrigation Water Diagram

Conservation and Survey Division

No abstract provided.

The Inapplicability Of The Concept Of The "Sidney Gravel" To The Ogallala Group (Late Tertiary) In Part Of Southern Banner County, Nebraska, Robert F. Diffendal Jr.

School of Natural Resources: Faculty Publications

A series of geologic maps of counties in western Nebraska was prepared for the Nebraska Geological Survey during the mid-1 930s. These maps showed the distribution of rock units of Tertiary age including a formation designated as the “Sidney.” The Sidney Gravel was described as a widespread sheetlike complex of channel deposits, but with small areas where it is not developed. In southern Banner County, Nebraska, there are several channels filled with sand and gravel that were mapped as Sidney in this series. Recently one of these channel fills has been observed to cut across the other. The fills are …

Cenozoic Paleogeography Of Western Nebraska, James B. Swinehart, Vernon F. Souders, Harold M. Degraw, Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

The Cenozoic strata of western Nebraska are an extensive sequence of continental deposits that extend eastward from the Hartville, Laramie, and Front Range uplifts and southeast from the Black Hills. The oldest Cenozoic sediments (Chadron Formation, White River Group) are Early Oligocene alluvial valley fills. Subsequent to filling of these drainages and continuing for about the next 7 million years, landscape development in western Nebraska was dominated by eolian deposition of tremendous volumes of rhyolitic volcanic ash derived from western eruptions. A plain of low relief, with only an occasional narrow drainage heading in the western highlands, was maintained during …

Keith County, Nebraska, Map Series, Robert F. Diffendal Jr., Mark S. Kuzila, J. R. Culver, Harold M. Degraw, R. R. Burchett, M. P. Carlson, T. Eversoll, William D. Gosnold, Nebraska Geological Survey

Robert F. Diffendal, Jr., Publications

Keith County--List of Maps and Their Authors

Topography--United States Geological Survey

Index of 7.5' Topographic Quadrangles and Township Boundaries--R. F. Diffendal, Jr.

Generalized Soils Map--M. Kuzila and J. Culver

Approximate Loess Thickness--R. F. Diffendal, Jr.

Bedrock Geologic Map--R. F. Diffendal, Jr.

Volcanic Ash Localities--R. F. Diffendal, Jr.

Ogallala Vertebrate Faunal Sites--R. F. Diffendal, Jr.

Ogallala Group Outcrops--R. F. Diffendal, Jr.

White River Group Outcrops--R. F. Diffendal, Jr.

Conservation and Survey Division Test Hole Locations--R. F. Diffendal, Jr.

Oil and/or Gas Test Hole Locations--R. F. Diffendal, Jr.

Mineral Resources Localities--R. F. Diffendal, Jr.

Locations of Registered Irrigation Wells--R. F. Diffendal, Jr. …

Annual Outflow Of Water From Nebraska, 1950 - 1985 And Annual Inflow Of Water To Nebraska, 1950 - 1985, Conservation And Survey Division

Conservation and Survey Division

No abstract provided.

Provenance Study Of Late Eocene Arkosic Sandstones In Southwest And Central Washington, Mark Edward Byrnes

Dissertations and Theses

The purpose of this study is to compare the sandstone composition and trace element geochemistry between samples representing the Summit Creek sandstone, Naches, Chumstick, and Carbonado Formations in order to determine if these sediments were all derived from the same provenance, and to determine the composition of the source rocks in hopes to identify the present day location of the source areas.

Significant Rises And Declines In Nebraska Groundwater Levels (From Pre-Development As Of Fall 1984)/Registered Irrigation Wells In Nebraska (As Of January 1, 1985, Conservation Survey Division, U.S. Geological Survey

Conservation and Survey Division

No abstract provided.

Atlas Illustrating The Characteristics Of Groundwater In Nebraska, Vince Dreeszen

Conservation and Survey Division

No abstract provided.

Airborne Thermal Mapping Of A "Flow-Through" Lake In The Nebraska Sandhills, Donald Rundquist, Gene Murray, Lloyd Queen

Conservation and Survey Division

No abstract provided.

Transmissivity Of The Principal Aquifer In Nebraska

Conservation and Survey Division

No abstract provided.

Concentration Of Nitrate-Nitrogen In Groundwater Central Platte Region, Nebrask 1984, M. E. Exner

Conservation and Survey Division

No abstract provided.