Earth Sciences Commons^™

Depositional And Deformational Structures In Three 'Esker-Like' Ridges, Southwestern Ontario, John D. Parish

Theses and Dissertations (Comprehensive)

The Dundalk Till Plain in southwestern Ontario is crossed by five “esker-like” ridges, believed to have been formed simultaneously during the early stage of the mid-Port Burce Stadial. The three middle ridges are the focus of this research, with each ridge having a different topographic form, but the length of, and distance between, ridges are similar. Occurrences of differing depositional structures and the presence of deformational structures over short lateral and vertical distances reveal the complexity of processes involved. The dominant primary sedimentary structures are large-scale tabular cross-beds. Many individual cross-beds are composed of poorly sorted, matrix-supported gravels. High variability …

A Notch-Strengthening Effect In Fresh-Water Ice, Wilfrid A. Nixon, Erland M. Schulson

Dartmouth Scholarship

Tensile tests have been performed onnotched and unnotched cylindrical samples of randomlyoriented polycrystalline ice of controlled grain-size (between2.2 and 7.3mm) at a loading rate of lOOPaS-l and at a temperature of -10 0c. In the notched samples, the notch-root diameter was 80% of the base diameter. Anotch-strengthening effect was observed in the large-grained ice, with fracture stresses being up to 50% higher than that for unnotched samples of the same grain-size. This notch-strengthening effect diminished as grain-size decreased, disappearing at a grain-size of "'3 mm. The notch-strengthening effect is explained in terms of the triaxial stress constraint at the notch …

Lottery Proceeds In California Pay For Installation Of A Ground-Water Monitoring System, June Ann Oberdorfer, J. W. Williams, M. G. Smelser

Faculty Publications

No abstract provided.

An Evaluation Of Phosphorus Export From Four Urban Land Uses During Summer Rainfall-Runoff Events In The Laurel Creek Watershed, E. Martin Pemberton

Theses and Dissertations (Comprehensive)

Cultural eutrophication, resulting from anthropogenic inputs of nutrients, such as phosphorus, can be detrimental to aquatic ecosystems. The effectiveness of recent phosphorus abatement programs, focused on point source inputs such as municipal and industrial effluent, has brought attention to the reduction of non-point sources, such as urban runoff. Target phosphate loads for the Great Lakes, set by the International Joint Commission, are deemed unattainable, without phosphorous reduction from non-point sources (Yaksich and Rumer, 1980), and it is with this knowledge that this thesis is undertaken. Analysis of phosphate export data from areas of different urban land uses indicates that residential …

Depositional Environments And Sandstone Diagenesis In The Tyler Formation (Pennsylvanian), Western North Dakota, Larry R. Quandt

Theses and Dissertations

Thirty-three oil well cores were examined and approximately 3,100 oil well logs were used to determine the depositional environments of the Tyler Formation (Pennsylvanian) in northwestern North Dakota. Ninety sandstone thin-sections were described and twenty-nine sandstone samples were analyzed by scanning electron microscope/X-ray microanalysis techniques to characterize sandstone diagenesis.

The Tyler Formation in northwestern North Dakota is correlative with the lower unit of the Tyler Formation in southwestern North Dakota. The upper unit of the Tyler Formation in southwestern North Dakota is not present in northwestern North Dakota, contrary to previous workers suggestions. The Tyler Formation in northwestern North Dakota …

Neogastropods (Melongenidae, Fasciolariidae, Turridae) From The Cannonball Formation (Paleocene: Thanetian), North Dakota And South Dakota, Brian E. Silfer

Theses and Dissertations

The Cannonball Formation of Paleocene age is a shallow-marine, clastic sequence exposed primarily in southwest-central North Dakota and northwestern South Dakota. The formation is characterized by alternating, poorly consolidated, relatively thin sandstone and thick mudstone units. The Cannonball neogastropod families Melongenidae, Fasciolariidae, and Turridae contain 20 species assigned to 15 genera based on 334 individuals from 50 localities. Four genera, Alticollarum, Obtusicarina, Vitticoncha, and Ericksonia are new, whereas Serrifusus, Mesorhytis, Rhombopsis, and Deussenia are first reported occurrences from Tertiary strata. Marshallaria is newly reported from North America and likely from the Northern Hemisphere. Twelve species are additions to the Cannonball …

Ultrastructure Des Sensilles Cylindriques, Mécanorécepteurs D'Un Crustacé Mysidacé Souterrain, Yves Crouau

International Journal of Speleology

The ultrastructural features of a new chordotonal sensillum in a cavernicolous Mysidacea is described. That sensillum and the other mechanoreceptor sensilla of the same Mysidacea are compared. 9 + 0 cilia show ultrastructural features which previously allowed us to establish a hypothesis with respect to the mode of functioning of chordotonal sensilla. That sensillum shows a pore at the tip of its external receptor.

Secondary Sympatric Occurrence Of Sibling Species Of Subterranean Shrimps In The Karst, M. Cobolli Sbordoni, M. Mattoccia, G. La Rosa, E. De Matthaeis, V. Sbordoni

International Journal of Speleology

Allozyme variation at 32 gene loci was studied in cave dwelling shrimps of the genus Troglocaris (fam. Atyidae). Populations were collected from several caves and wells belonging to different drainage systems in the Karst areas of NE Italy. Results suggest the existence of two sympatric, genetically distinct, biological species (provisionally indicated as species A and B in the T. anophthalmus complex) in the samples collected at the Duino Well, Sagrado and Comarie caves (Nei’s `D= 0.209). Samples from Gradisca and Aurisina are represented by only one (A) or the other (B) of the two species, respectively. Two remaining eastern populations …

Isopoda (Crustacea: Isopoda: Microcharon, Jaera, Proasellus) And Other Fauna In Hypogean Waters Of Southern Cyprus, Boris Sket

International Journal of Speleology

Springs and wells in SW and S part of Cyprus were briefly surveyed. Chlorinity was 0.1 - 0.8 p.p.t. Some isopods were found in collecting galleries of springs and in wells in calcarenites and in gravel deposits. These were Proasellus coxalis ssp. with some depigmented specimens, the probably stygobitic P. c. nanus ssp. n., poorly pigmented Jaera italica, and Microcharon luciae n. sp.; they were accompanied by the stygobitic amphipod Bogidiella cypria, by Turbellaria (Tricladida), by Copepoda (Cyclopoida), and rarely by some other animals (Pisidium sp., Oligochaeta). Only slightly depigmented Turbellaria Tricladida (cf. Dugesia sp.) occur in …

Subsurface And Geochemical Stratigraphy Of Northwestern Oregon, Olga Berenice Lira

Dissertations and Theses

Lithological, geophysical, paleontological and geochemical methods were used in order to define the contact relationship between the Keasey and the Cowlitz formations in northwestern Oregon. Drill cuttings from six wells located in Columbia County were analyzed by the Instrumental Neutron Activation Analysis (INAA) method. The concentrations of K, Th, Rb and Sc/Co ratio in the samples established four different groups: 1) High K, Rb, and TH, with low Sc/Co ratio typical of Cowlitz sediments. 2) Low K, Th and Rb and high Sc/Co ratio, more characteristics of the Keasey Formation. 3) Very low concentrations of Rb and high Sc, which …

The Hydrogeologic Effects Of Fly Ash Utilization In Concrete At Coal Creek Station, Underwood, North Dakota, Terry R. Johnson

Theses and Dissertations

Coal Creek Station is a two-unit 1100 megawatt electrical power plant located in southern McLean county, North Dakota. Annually, 5 million tons (4.5 million metric tons) of lignite are burned at the plant producing 550,000 tons (500,000 metric tons) of fly ash. Approximately 80,000 tons (72,624 metric tons) of ash are sold as a cement replacement, while the remainder is disposed of in lined evaporation ponds. The present study investigates the environmental consequences of ash utilization as an alternative to disposal, The Electric Power Research Institute (EPRI) provided funding for this investigation which involves the installation of 5,288 cu yds …

The Broom Creek Formation (Permian), In Southwestern North Dakota: Depositional Environments And Nitrogen Occurrence, Marvin E. Rygh

Theses and Dissertations

In North Dakota, the Broom Creek Formation (Wolfcampian> exists in the subsurface as the upper unit of the Minnelusa Group. The Broom Creek Formation consists of pink quartzarenite with some intervening dolostone beds. The identification of lithofacies, areal distribution, and stratigraphic relationships were determined from oil well logs, mainly the dual laterolog suite and the FDC-CNL log suite, and macroscopic and microscopic core analysis. were examined from four wells.

The major lithofacies identified are, 1) eolian Cores sandstone, 2) nearshore marine sandstone, and 3) marine carbonate. From the sandstone-dolostone distribution, marine predominance existed in the eastern part of the study …

Depositional Environments, Ichnology And Diagenesis Of The Upper Frobisher-Alida Beds Of The Elkhorn Ranch And Roughrider Fields Of Western North Dakota, Jeffrey R. Valvik

Theses and Dissertations

The upper Frobisher-Alida interval of western North Dakota was studied in order to determine the depositional envirornnents, bioturbation features, and the diagenetic history of these carbonate and evaporite rocks.

Detailed examination resulted in the identification of six distinct lithotypes: 1) crinoid, coral packstone-wackestone (LT-1); 2) brachiopod, skeletal wackestone (LT-2); 3) skeletal, burrowed mudstone-wackestone; 4) intraclast, peloid packstone-grainstone; 5) peloid, intraclast, ostracode packstone-wackestone; 6) nodular and bedded anhydrite (LT-6). Lithofacies generally follow a depositional sequence of thick units of sublittoral carbonates, followed by a thin sequence of littoral carbonates, and culminating in a thick unit of sublittoral evaporites. Sublittoral rocks dominate …

Middle Eocene Foraminifera From The Piney Point Formation Of The Virginia And Maryland Coastal Plain, Megan S. Jones

OES Theses and Dissertations

This study examines the foraminiferal fauna, both benthic and planktonic, of the outcropping (45 samples) and subsurface (31 samples) middle Eocene Piney Point Formation in Virginia and Maryland. The primary objective of this study is to further refine the depositional history of the Salisbury Embayment which is represented by the middle Eocene Piney Point Formation. Ninety-six species of benthic and planktonic foraminifera were identified in this study. Of these, several are characteristic of the middle Eocene: Asterigerina texana, Hanzawaia danvillensis, Ceratobulimina exima, Cibicides westi, Chiloguembelitria columbiana, C. stavensis, Testacarinata inconspicua and Pseudohastigerina wilcoxensislmicra. While these were relatively abundant, diagnostic middle …

Two New Niphargus Species (Amphipoda) From Caves In Yugoslavia, Gordan Karaman, Boris Sket

International Journal of Speleology

Niphargus numerus sp. n. from the Čavlinska pećina near Obrovac (Dalmatia) and N. factor sp. n. from Vjetrenica (Hercegovina) are described. Both new species from Yugoslav caves belong to the N. transitivus aggregate of species.