Earth Sciences Commons^™

Dehydration Tolerance Of Several Populus Deltoides Clones, G. Michael Gebre

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Reproductive Biology Of Pinus Sylvestris L.: Seed Yield, Flower Phenology, The Response Of Young Seedlings To Ga 4/7, And Developmental Anatomy, Teresa K. Boes

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

Groundwater Levels In Nebraska, 1988, Michael J. Ellis, Gregory V. Steele, Perry B. Wigley

Conservation and Survey Division

No abstract provided.

A Revision Of The North American Papillose Allocreadiidae (Digenea) With Independent Cladistic Analyses Of Larval And Adult Forms, Janine N. Caira

Bulletin of the University of Nebraska State Museum

Adult specimens of all 19 North American species of papillose allocreadiids were examined. A description and figure is given for the adult of each species; details of the cirrus sacs are presented for most spesies for the first time. Descriptions were emended where necessary and judgments were made on synonymies. Scanning electron micrographs of the oral sucker of 10 species are presented as is a new key to the 19 species. A cladistic analysis was performed on the group based on adult characters. The analysis indicated that the group is monophyletic on the basis of the ventral papillae associated with …

Habitat Use And Diet Analysis Of Breeding Common Barn-Owls In Western Nebraska, Joseph A. Gubanyi M.S.

School of Natural Resources: Dissertations, Theses, and Student Research

I studied barn owl (Tyto alba) breeding biology in western Nebraska 1984-1986. I had greatest success capturing males (56% success) at night using trap doors at nest sites and females (91 % success) using hoop nets at nest sites during the day. Barn owls removed 16 of 23 tail-mounted radios. Eight birds were radio-tracked for 7-14.5 hours. The mean foraging range was 198 ha (32- 299 ha, n = 8) with < 1 % overlap among birds from adjacent nest sites. Field-tested telemetry error was high (mean displacements of radio-locations for 2 birds were 208 and 241 m). I found no relationship between percent cover in foraging habitat and reproductive success. I identified 10,140 prey items from 15 nest sites and found both annual and seasonal variation in barn owl diets. Microtus ochrogaster occurred most frequently (32.7%) and increased in the diet from 17.6 to 27.2 to 43.5% 1984-1986. M. ochrogaster and Perognathus hispidus annual frequencies were …

Evolution Of The Aeluroid Carnivora: Significance Of The Ventral Promontorial Process Of The Petrosal, And The Origin Of Basicranial Patterns In The Living Families, Robert M. Hunt Jr.

Department of Earth and Atmospheric Sciences: Faculty Publications

In studies of carnivoran phylogeny, the configuration and ontogenetic development of the auditory bulla enclosing the middle ear have been useful in tracing modern lineages to their first appearances in the mid-Cenozoic. Pre-Oligocene carnivorans, however, lack preserved bullae and have been difficult to relate to later Cenozoic groups. The carnivoran petrosal bone, because of its durability both in intact skulls and as an isolated element, can be tracked through Cenozoic time, and can supply new information on lineage continuity through its geometry and spatial relationships. Aeluroid carnivorans are united by a petrosal of characteristic shape, distinguished by a ventral promontorial …

Resultats Preliminaires De La Campagne De Forages Du Joides Resolution Sur Le Plateau De Kerguelen (Odp Leg 120)/ Preliminary Results Of Odp Leg 120 In The Central And Southern Kerguelen Plateau, Roland Schlich, Marc Munschy, Hubert Whitechurch, Marie-Pierre Aubry, Sherwood Wise Jr., Amanda Palmer, William Berggren, Peter Bitschene, Neal Blackburn, James Breza, Millard Coffin, David M. Harwood, Franz Heider, Mary Anne Holmes, William Howard, Hiroo Inokuchi, Kerry Kelts, David Lazarus, Andreas Mackenzen, Toshiaka Maruyama, Elizabeth Pratson, Patrick Quilty, Frank Rack, Vincent Salters, James Sevigny, Michael Storey, Atsushi Takemura, David Watkins, James Zachos

Department of Earth and Atmospheric Sciences: Faculty Publications

Resume - Le Leg 120 du programme international de forages oceaniques (Ocean Drilling Project) a permis de determiner la nature et l'age du plateau de Kerguelen et de decrire son evolution depuis Ie Cretace. Le socle, fore aux sites 747, 749 ct 750, est compose de coulees basaltiqucs qui correspondent a des tholeiites transitionnelles saturees en silice. Ces basaltes se sont mis en place dans des conditions aeriennes ou sub-aeriennes avant Ie Cenomanien sur une surface quasiment horizontalc. Les premiers sediments, d'age Cenomanien, se sont deposes en milieu fluviatile. Au Campanien et a la fin du Maestrichtien Ie plateau a …

Geochemical Evidence For Suppression Of Pelagic Marine Productivity At The Cretaceous/Tertiary Boundary, James C. Zachos, Michael A. Arthur, Walter E. Dean

United States Geological Survey: Staff Publications

The normal, biologically productive ocean is characterized by a gradient of the ¹³C /¹²C ratio from surface to deep waters. Here we present stable isotope data from planktonic and benthic microfossils across the Cretaceous/Tertiary boundary in the North pacific, which reveal a rapid and complete breakdown in this biologically mediated gradient. The fluxes of barium (a proxy for organic carbon) and CaCO, also decrease significantly at the time of the major marine plankton extinctions. The implied substantial reduction in oceanic primary productivity persisted for ~0.5 Myr before the carbon isotope gradient was gradually re-established. In addition, the …

Mineral Yearbook Of Nebraska-1989, Karl Starch, Raymond R. Burchett

Conservation and Survey Division

No abstract provided.

Johnson County Test Hole Logs, Raymond R. Burchett, Frank A. Smith

Conservation and Survey Division

No abstract provided.

Resource Notes-Academic Year 1988-89

Conservation and Survey Division

No abstract provided.

Nebraska Mineral Operations Review, 1988, Raymond R. Burchett, Duane A. Eversoll

Conservation and Survey Division

No abstract provided.

Cyclostephanos Lacrimis N. Sp. And Cyclostephanos Guatemalae N. Sp.: Two New Centric Diatoms From The Fossil Record Of Guatemala, Edward Theriot, J. Platt Bradbury

United States Geological Survey: Staff Publications

Two new species of Cyclostephanos are described from Pleistocene diatomites near Lago de Atitlan, Guatemala. In both species, radiating costae continue un- branched to the valve margin and the external expression of the single labiate process is an elongate pore on the mantle beneath a spine. Cyclostephanos lacrimis n. sp. is 7-75 jum in diameter and has no central area strutted processes. Each mantle strutted process is located within a marginal alveolus directly adjacent to a costa; this unique location is usually visible with light microscopy. C. guatemalae n. sp. is smaller (5-23 μm), with a single eccentrically-located strutted process …

State Of Stress And Modern Deformation Of The Northern Basin And Range Province, Mary Lou Zoback

United States Geological Survey: Staff Publications

Constraints on the current stress regime of the actively extending northern Basin and Range province are provided by deformation data (focal mechanisms and fault slip studies), hydraulic fracturing in situ stress measurements, borehole elongation ("breakouts") analyses, and alignment of young volcanic vents. The integrated data indicate significant variations both in principal stress orientations and magnitudes. An approximately E-W least principal stress direction appears to characterize both the eastern and western margins of the Basin and Range province, whereas in the active interior parts of the province extension occurs in response to a least principal stress oriented NW to N60 °W. …

The Style Of Late Cenozoic Deformation At The Eastern Front Of The California Coast Ranges, Carl M. Wentworth, Mark D. Zoback

United States Geological Survey: Staff Publications

The 1983 Coalinga earthquake occurred at the eastern boundary of the California Coast Ranges in response to northeast directed thrusting. Such movements over the past 2 Ma have produced Coalinga anticline by folding above the blind eastern tip of the Coalinga thrust zone. The 600-km length of the Coast Ranges boundary shares a common structural setting that involves westward upturn of Cenozoic and Cretaceou strata at the eastern front of the Coast Ranges and a major, southwest facing step in the basement surface beneath the western Great Valley. Like Coalinga anticline, Pliocene and Quaternary folding and faulting along the rest …

The Uranium-Trend Dating Method: Principles And Application For Southern California Marine Terrace Deposits, Daniel R. Muhs, John N. Rosholt, Charles L. Bush

United States Geological Survey: Staff Publications

Uranium-trend dating is an open-system method for age estimation of Quaternary sediments, using disequilibrium in the ²³⁸U–²³⁴U–²³⁰Th decay series. The technique has been applied to alluvium, colluvium, loess, till, and marine sediments, in this study we tested the U-trend dating method on calcareous marine terrace deposits from the Palos Verdes Hills and San Nicolas Island, California. Independent age estimates indicate that terraces in these areas range from –80 ka to greater than 1.0 Ma. Two low terraces on San Nicolas Island yielded U-trend plots that have a clustered array of points and the ages of …

Geology Of The Pre-Dune Strata, James B. Swinehart, Robert F. Diffendal Jr.

School of Natural Resources: Faculty Publications

Over the last 98 million years, four general geological processes have acted to shape the ancient landscapes buried beneath the Sand Hills. Three of these affected the area directly, either depositing sediments on the land surface or eroding it, while a fourth took place west of Nebraska, but affected the region nonetheless.

Shells of clams, oysters, and numerous other kinds of creatures similar to forms that live today in the seas are preserved as fossils in the chalks, limestones, and shales that form the oldest rocks beneath the Sand Hills that will be described. These deposits indicate to geologists that …

Late Pennsylvanian And Early Permian Cyclic Sedimentation, Paleogeography, Paleoecology, And Biostratigraphy In Kansas And Nebraska, Roger K. Pabian, Robert F. Diffendal, Jr. Jr.

Robert F. Diffendal, Jr., Publications

Overview of Upper Pennsylvanian Cyclic Sedimentation in Kansas and Nebraska, Philip H. Heckel, Department of Geology, University of Iowa, Iowa City, Iowa

With contributions from:

Christopher G. Maples and W. Lynn Watney, Kansas Geological Survey, Lawrence, Kansas

John Harris, Shell Western Exploration and Production, Inc., Houston, Texas

David Ball, Champlin Petroleum Company, Houston, Texas

Philip H. Heckel, University of Iowa, Iowa City, Iowa

R. R. West, V. Voegeli, S. Roth, K. Leonard, H. R. Feldman, and C. Cunningham, Kansas State University, Manhattan, Kansas

Royal H. Mapes, Ohio University, Athens, Ohio

Hans-Peter Schultze, University of Kansas, Lawrence, Kansas

R. Matt Joeckel, …

Lake Maloney Quadrangle, Nebraska--Lincoln County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

7.5 minute series (topographic)

100° 45' to 100° 52' 30"

41° 00' to 41° 07' 30"

Includes Ogallala Outcrops (pencil)

Nebraska Natural Resources District Boundaries, Nebraska Department Of Natural Resources

Conservation and Survey Division

No abstract provided.

Gage County Test Hole Logs, Raymond R. Burchett, Frank A. Smith

Conservation and Survey Division

No abstract provided.

Pawnee County Test Hole Logs, Raymond R. Burchett, Frank A. Smith

Conservation and Survey Division

No abstract provided.

Nemaha County Test Hole Logs, Raymond R. Burchett, Frank A. Smith

Conservation and Survey Division

No abstract provided.

Otoe County Test Hole Logs, Raymond R. Burchett, Frank A. Smith

Conservation and Survey Division

No abstract provided.

Nebraska Natural Resources District Boundaries, Nebraska Natural Resources Commission

Conservation and Survey Division

No abstract provided.

Significant Rises And Declines In Nebraska Groundwater Levels (From Pre-Development As Of Fall 1987)/Registered Irrigation Wells In Nebraska (As Of January 1, 1988), Conservation Survey Division

Conservation and Survey Division

No abstract provided.