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The KnowledgeBank at OSU (76.380 recursos)

Knowledge Bank contains collections of presentations, publications and reports related to Ohio State University.

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Mostrando recursos 1 - 20 de 898

  1. Folding mechanisms within the Saltville Thrust Sheet, Valley and Ridge Province, Tennessee

    Swartz, Christopher H.
    Field and laboratory analysis of structures present in an outcrop of a massive carbonate unit within the Ordovician Sevier Shale, located in the Saltville thrust sheet in northeast Tennessee, indicates that folding was produced by a buckling mechanism accommodated by flexural-slip/flow during thrust sheet transport. The modified class 1B geometry of the folds and the kinematic indicators found in the outcrop are consistent with these folding mechanisms. Analysis of timing relations of the structures, as well as comparisons to studies performed on similar rock units in the vicinity of this outcop, indicate that modification of the folds by a flattening...

  2. Phylogeny of freshwater crayfish

    Stigall, Alycia L.
    The phylogeny of freshwater crayfish, including both fossil and extant taxa, is assessed using morphologic analysis and nucleotide sequencing. Based on external morphologic characters, primarily characters of the carapace and appendages, the crayfish are reconfirmed as a monophyletic group. The nearest sister taxon to the crayfish is the Chilenophoberidae. Within the crayfish, the longstanding distribution of species among three families is supported. The superfamily Astacoidea is redefined to include three families, Astacidae, Cambaridae, and Parastacidae. By including the Parastacidae in the Astacoidea, the superfamily Parastacoidea becomes superfluous and is now suppressed. The Astacoidea is characterized by several synapomorphies: a diaresis...

  3. The paleoecology of the Marshalltown Formation of the central and southern New Jersey Upper Cretaceous

    Slimmer, Dorothy Fay
    No embargo

  4. Monte-Carlo simulation of traveltime-related capture zones of advective contaminant migration to wells

    Safreed, Connie Marie
    No embargo

  5. An ice flow model and its application to a flowline in the central portion of the Greenland ice sheet

    Richardson, Cynthia A.
    Radar soundings from Greenland show internal layering in the ice sheet. Many investigators have suggested that these layers represent ancient depositional surfaces. An ice flow model assuming steady-state is used to calculate depths of isochrons. This model uses measured ice thickness and accumulation rates to calculate vertical and horizontal velocities. From this vertical strain rates, average annual layer thickness, and depths of isochrons are calculated. Comparison of the calculated isochrons with the internal radar layering shows close agreement between shallow-depth radar layering and young isochrons, but increasing discrepancies with depth. This is interpreted as showing that the layers do represent...

  6. Correlation and source direction of Green River Formation Tuffs in San Pete County, Utah

    Lichy, David E.
    Tuffs in the Eocene Green River Formation from San Pete County in central Utah have been examined in three detailed stratigraphic sections and fourty-one petrographic thin sections. The Green River Formation can be divided into a lower member dominated by mudstone and an upper unit dominated by limestone, both of which are mainly lacustrine in origin. Interbedded throughout the formation are numerous, thin, air-fall tuffs. Primary tuff minerals in order of decreasing abundance are biotite, hornblende, potash feldspar, and quartz with accessory muscovite and sphene. Secondary (diagenetic) minerals include calcite, zeolite, pyrite, and clays. Glass shards are rarely recognizable since...

  7. Subsurface flow characteristics of recharge pits as determined from a laboratory model

    Schultz, Thomas R.
    In order to design an efficient ground water recharge area, the movement of recharged water beneath the surface of a pit must be understood. With the aid of a model to study the water movement, certain flow characteristics were detected, figured and described. The series of experiments began with an isotropic medium and progressed through more complex tests to the final one, which consisted of several stratified layers of different sized granular material. The granular material consisted of sorted sand and gravel.

  8. Late Wisconsin Lake silts of southeastern Fairfield County and northeastern Hocking County, Ohio

    Newhart, Joseph A.
    A study of the late Wisconsin lake silts of southwestern Fairfield County and northeastern Hocking County indicates that the lake was formed due to the damming effect of late Wisconsin glacial outwash. The lake occupied the valleys between Lancaster, Bremen, and Clear Creek. The sediments decrease in coarseness away from the outwash dams, indicating the glaciers as the principle source of lake water. Mollusk shells found in the lake silts are fresh water forms of mid-Pleistocene to present in age.

  9. Late Wisconsin Lake silts of southeastern Fairfield County and northeastern Hocking County, Ohio

    Newhart, Joseph A.
    A study of the late Wisconsin lake silts of southwestern Fairfield County and northeastern Hocking County indicates that the lake was formed due to the damming effect of late Wisconsin glacial outwash. The lake occupied the valleys between Lancaster, Bremen, and Clear Creek. The sediments decrease in coarseness away from the outwash dams, indicating the glaciers as the principle source of lake water. Mollusk shells found in the lake silts are fresh water forms of mid-Pleistocene to present in age.

  10. Pollution in the North Fork of the Licking River

    Morgan, Mike
    No embargo

  11. Glacial lake sediments in upper Clear Creek Valley, southcentral Fairfield County, Ohio

    Mitchell, Michael
    A study of the soil types and cores taken in a portion of southwestern Fairfield County indicates the presence of glaciolacustrine silts and clays in the Clear Creek Valley from Clearport, northwest, to Amanda. Mollusc shells found buried in the deposits of silty clay are fresh water forms and of mid-Pleistocene to present in age. However, the fact that these shells were buried in a matrix of late Pleistocene origin, indicates that they are of that age. The sediments decrease in coarseness away from the dam and decrease in coarseness from the edges to the center of ancient lake deposits....

  12. Glacial lake sediments in upper Clear Creek Valley, southcentral Fairfield County, Ohio

    Mitchell, Michael
    A study of the soil types and cores taken in a portion of southwestern Fairfield County indicates the presence of glaciolacustrine silts and clays in the Clear Creek Valley from Clearport, northwest, to Amanda. Mollusc shells found buried in the deposits of silty clay are fresh water forms and of mid-Pleistocene to present in age. However, the fact that these shells were buried in a matrix of late Pleistocene origin, indicates that they are of that age. The sediments decrease in coarseness away from the dam and decrease in coarseness from the edges to the center of ancient lake deposits....

  13. The microcosm of scientific knowledge: scientists are talking, but mostly to each other

    Suleski, Julie M.
    Communication of results has long been recognized as the final step in the scientific process. Publication in scientific journals has been the accepted method of communication. In the years 1990-1991 there were over 5,300 accredited scientific journals in print indexed by ISI. However, far less than 1 % of the papers published in those journals were subsequently reported on in the top mainstream printed news media. Well over 99% of the scientific papers published failed to be noticed by mainstream publications and mainstream audiences. This begs the question, that as scientists, is it sufficient to publish results in highly technical...

  14. Antarctica Landsat TM imagery: exploring enhancement techniques for visual geologic interpretation

    Pennington, Lana K.
    No embargo

  15. Geology, petrology, and heavy mineral study of kimberlites from Riley County, Kansas

    Reinkensmeyer, Jeffrey E.
    Ten kimberlite bodies are known to exist in northern Riley County, Kansas. Five of the bodies outcrop (Bala, Leonardville, Randolph No. 1, Randolph No. 2, and Stockdale) and five were discovered by drilling (Fancy Creek, Lone Tree, Lone Bush, Swede Creek, and Winkler). Magnetometer studies have revealed that the bodies dip steeply to the SE and are oriented normal to the Abilene anticline which parallells a Precambrian fault, probably of the mid-continent Keweenawan rift system. Based on mineralogy, texture, and structure, eight of the ten known kimberlites of Riley County represent the three kimberlite facies as described by Mitchell (1986)....

  16. Geology, petrology, and heavy mineral study of kimberlites from Riley County, Kansas

    Reinkensmeyer, Jeffrey E.
    Ten kimberlite bodies are known to exist in northern Riley County, Kansas. Five of the bodies outcrop (Bala, Leonardville, Randolph No. 1, Randolph No. 2, and Stockdale) and five were discovered by drilling (Fancy Creek, Lone Tree, Lone Bush, Swede Creek, and Winkler). Magnetometer studies have revealed that the bodies dip steeply to the SE and are oriented normal to the Abilene anticline which parallells a Precambrian fault, probably of the mid-continent Keweenawan rift system. Based on mineralogy, texture, and structure, eight of the ten known kimberlites of Riley County represent the three kimberlite facies as described by Mitchell (1986)....

  17. Petrographic study of selected basalts from Mt. Kilimanjaro, Tanzania

    Miller, Mark W.
    Thin sections were made of rocks collected from Mt. Kilimanjaro, Mt. Meru, Ngorongoro crater, and Lake Manyara in northern Tanganyika. Descriptions of the sections showed the rocks to be critically undersaturated Alkali basalts composed primarily of plagioclase An27 - An60, augite, and forsteritic olivine.

  18. Historical analysis and stochastic modeling of the Great Lakes outflows

    Sparks, Mary Wilson
    No embargo

  19. Diaton biostratigraphic correlation of Deep Sea Drilling Project Sites 270, 272, Ross Sea, Antarctica

    Renz, Michael E.
    Drilling Sites 270, 272, and 271 of the Deep Sea Drilling Project, (DSDP) were intended to sample a thick continuous sequence of sediments in the Ross Sea. This objective was not achieved due to the fact that the requisite depths were not reached. Diatom assemblages from DSDP Sites 270 and 272 are used to determine the temporal relationship between these holes. Diatoms reported here from Site 270, represent the first pre-Pleistocene diatoms recovered at this locality. Ages and diatom zonations of earlier studies of these sites are confirmed, although some revisions are made. A maximum age for the lower most...

  20. Jurassic, Cretaceous, and Tertiary megafossils from the Riyadh region of East-Central Saudi Arabia

    McCutchen, Richard E.
    Gastropods, bivalves, cephalopods, corals, and other fossils collected from Riyadh area, Saudi Arabia are significant for interpreting the age of the host rocks. The fossils range from Late Jurassic to Eocene in age. Descriptions are given of the significant components of the fauna. The state of preservation is generally good although the specimens are preserved as steinkerns. Stratigraphic information is provided for the several fossil-bearing sections yielding these fossils.

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