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Datasets with geocode "SECTION, height"

Mostrando recursos 1 - 20 de 154

  1. Anisotropy-magnetic susceptibility from the Krems Wachtberg archaeological Site (Austria) and high temperature susceptibility

    Zeeden, Christian; Hambach, Ulrich; Händel, Marc
    The loess sediment embedding the main Gravettian layer at the Krems-Wachtberg archaeological site facilitates exceptional preservation. To gain insight in the sedimentation process before and after the Paleolithic settlement, the magnetic fabric (preferential orientation of magnetic particles) of loess of the Krems-Wachtberg site is investigated. Magnetic fabric properties clearly show an eolian origin of the loess, but may indicate some relocation in the meter above the cultural layer. The magnetic fabric properties can be divided into three intervals, the top interval shows lowest foliation and inconsistent magnetic fabric directions. The middle interval around the main cultural layer shows low foliation,...

  2. Anisotropy-magnetic susceptibility from the Krems Wachtberg archaeological Site (Austria), section 2

    Zeeden, Christian; Hambach, Ulrich; Händel, Marc

  3. Anisotropy-magnetic susceptibility from the Krems Wachtberg archaeological Site (Austria), section 1

    Zeeden, Christian; Hambach, Ulrich; Händel, Marc

  4. Alkenone stable carbon isotopes, carbonate stable carbon and oxygen isotopes, planktic foraminifera boron isotopes and atmospheric CO2 calculations and box model results from Ras il-Pellegrin section, Malta

    Badger, Marcus P S; Lear, Caroline H; Pancost, Richard D; Foster, Gavin L; Bailey, Trevor R; Leng, Melanie J; Abels, Hemmo A
    The development of a permanent, stable ice sheet in East Antarctica happened during the middle Miocene, about 14 million years (Myr) ago. The middle Miocene therefore represents one of the distinct phases of rapid change in the transition from the "greenhouse" of the early Eocene to the "icehouse" of the present day. Carbonate carbon isotope records of the period immediately following the main stage of ice sheet development reveal a major perturbation in the carbon system, represented by the positive d13C excursion known as carbon maximum 6 ("M6"), which has traditionally been interpreted as reflecting increased burial of organic matter...

  5. An integrated biostratigraphy (conodonts and foraminifers) and chronostratigraphy (paleomagnetic reversals, magnetic susceptibility, elemental chemistry, carbon isotopes and geochronology) for the Permian-Triassic strata of Guandao section

    Lehrmann, Daniel; Stepchinski, Leanne; Altiner, Demir; Orchard, Michael J; Montgomery, Paul; Enos, Paul; Ellwood, Brooks B; Bowring, Samuel A; Ramezani, Jahandar; Wang, Hongmei; Wei, Jiayong; Yu, Meiyi; Griffiths, James D; Minzoni, Marcello; Schaal, Ellen K; Li, Xiaowei; Meyer, Katja M; Payne, Jonathan L
    The chronostratigraphy of Guandao section has served as the foundation for numerous studies of the end-Permian extinction and biotic recovery in south China. Guandao section is continuous from the Permian-Triassic boundary to the Upper Triassic. Conodonts enable broad delineation of stage and substage boundaries and calibration of foraminifer biostratigraphy as follows. Changhsingian-Griesbachian: first Hindeodus parvus, and first appearance of foraminifers Postcladella kalhori and Earlandia sp. Griesbachian-Dienerian: first Neospathodus dieneri, and last appearance of foraminifer P. grandis. Dienerian-Smithian: first Novispathodus waageni and late Dienerian first appearance of foraminifer Hoyenella ex gr. sinensis. Smithian-Spathian: first Nv? crassatus and last appearance of foraminifers Arenovidalina...

  6. Stable carbon and oxygen isotope compositions of bulk rock samples analyzed from the Zumaia section

    Dinarès-Turell, Jaume; Westerhold, Thomas; Pujalte, Victoriano; Röhl, Ursula; Kroon, Dick
    Astronomical tuning of sedimentary records to precise orbital solutions has led to unprecedented resolution in the geological time scale. However, the construction of a consistent astronomical time scale for the Paleocene is controversial due to uncertainties in the recognition of the exact number of 405-kyr eccentricity cycles and accurate correlation between key records. Here, we present a new Danian integrated stratigraphic framework using the land-based Zumaia and Sopelana hemipelagic sections from the Basque Basin and deep-sea records drilled during Ocean Drilling Program (ODP) Legs 198 (Shatsky Rise, North Pacific) and 208 (Walvis Ridge, South Atlantic) that solves previous discrepancies. The...

  7. Mineral quantification of a Jordan Cretaceous outcrop (Section GM3, Ghawr Al Mazar, Ghor al Mazrar)

    Wendler, Jens E; Wendler, Ines; Vogt, Christoph; Kuss, Hans-Joachim
    Cyclic fluctuations in global sea level during epochs of warm greenhouse climate have remained enigmatic, because absence or subordinate presence of polar ice during these periods precludes an explanation by glacio-eustatic forcing. An alternative concept suggests that the water-bearing potential of groundwater aquifers is equal to that of ice caps and that changes in the dynamic balance of aquifer charge versus discharge, as a function of the temperature-related intensity of the hydrological cycle, may have driven eustasy during warm climates. However, this idea has long been neglected for two reasons: 1) the large storage potential of subsurface aquifers was confused...

  8. Carbonate content and d13C record of a Jordan Cretaceous outcrop (Section GM3 (Ghawr Al Mazar (Ghor al Mazrar))

    Wendler, Jens E; Meyers, Stephen R; Wendler, Ines; Kuss, Hans-Joachim
    An evaluation of the global synchronicity and duration of "3rd-order" sea-level fluctuations during the Cretaceous greenhouse has been hampered by poor constraints on potential climatic and tectonic drivers, and limitations of geochronology and chronostratigraphic correlation. To provide insight into the nature of such sea-level fluctuations, here we present a new Late Cretaceous record from the Jordanian Levant Platform, comprising a detailed physical-, bio-, chemo- and sequence stratigraphy. Carbonate content of these strata reflects overall sequence stratigraphic development, and demonstrates a dramatic 3rd-order-scale cycle that is also apparent in the d°C record. Updated radioisotopic constraints and astrochronologic testing provide support for...

  9. (Table 2) Stratigraphic position of midpoints of reddish and beige layers of lithologic cycles in the Loulja-A Section and their astronomical ages after tuning to the ETP and Summer Insolation Curves of the La2004 solution

    van der Laan, E; Snel, E; de Kaenel, Eric P; Hilgen, Frederik J; Krijgsman, Wout
    An integrated high-resolution stratigraphy and orbital tuning is presented for the Loulja sections located in the Bou Regreg area on the Atlantic side of Morocco. The sections constitute the upward continuation of the upper Messinian Ain el Beida section and contain a well-exposed, continuous record of the interval straddling the Miocene-Pliocene (M-P) boundary. The older Loulja-A section, which covers the interval from ~5.59 to 5.12 Ma, reveals a dominantly precession-controlled color cyclicity that allows for a straightforward orbital tuning of the boundary interval and for detailed cyclostratigraphic correlations to the Mediterranean; the high-resolution and high-quality benthic isotope record allows us...

  10. Ichthyolith accumulation and age models from DSDP 527, DSDP 596, ODP 886, ODP 1209, and Gubbio

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D
    Open ocean ecosystems experienced profound disruption in biodiversity and structure during the Cretaceous-Paleogene (K-Pg) mass extinction ~66 million years ago. Extinction scenarios have suggested that a collapse of phytoplankton production rippled up the food chain causing wholesale loss of consumers and top predators. Pelagic fishes represent a key trophic link between primary producers and top predators and provide a means to examine the influence of trophic relationships during extinctions. Here we show that there is geographic heterogeneity in the abundance of fishes through the mass extinction using the accumulation rate of ichthyoliths (i.e., microscopic fish teeth and shark dermal scales)....

  11. Ichthyolith counts and MAR at Gubbio outcrop

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D

  12. Age model of Gubbio outcrop

    Sibert, Elizabeth C; Hull, Pincelli M; Norris, Richard D

  13. (Table 1) Boron, carbon, magnesium and calcium isotope data, post-Marinoan Neoproterozoic carbonate sections, Namibia

    Kasemann, Simone A; Pogge von Strandmann, Philip A E; Prave, Anthony R; Fallick, Anthony E; Elliott, Tim; Hoffmann, Karl-Heinz
    A marked ocean acidification event and elevated atmospheric carbon dioxide concentrations following the extreme environmental conditions of the younger Cryogenian glaciation have been inferred from boron isotope measurements. Calcium and magnesium isotope analyses offer additional insights into the processes occurring during this time. Data from Neoproterozoic sections in Namibia indicate that following the end of glaciation the continental weathering flux transitioned from being of mixed carbonate and silicate character to a silicate-dominated one. Combined with the effects of primary dolomite formation in the cap dolostones, this caused the ocean to depart from a state of acidification and return to higher...

  14. Age determination of sediments from Kilkeel and sediment core Y69-71P

    Clark, Peter U; McCabe, A Marshall; Mix, Alan C; Weaver, Andrew
    Evidence from the Irish Sea basin supports the existence of an abrupt rise in sea level (meltwater pulse) at 19,000 years before the present (B.P.). Climate records indicate a large reduction in the strength of North Atlantic Deep Water formation and attendant cooling of the North Atlantic at this time, indicating a source of the meltwater pulse from one or more Northern Hemisphere ice sheets.Warming of the tropical Atlantic and Pacific oceans and the Southern Hemisphere also began at 19,000 years B.P. These responses identify mechanisms responsible for the propagation of deglacial climate signals to the Southern Hemisphere and tropics...

  15. (Table 1) Age determination of Kilkeel section

    Clark, Peter U; McCabe, A Marshall; Mix, Alan C; Weaver, Andrew

  16. (Table 1) Bulk Fe isotope values and pyrite framboids sizes of Cenomanian-Turonian samples

    Jenkyns, Hugh C; Matthews, Alan; Tsikos, Harilaos; Erel, Yigal
    Organic carbon-rich shales from localities in England, Italy, and Morocco, which formed during the Cenomanian-Turonian oceanic anoxic event (OAE), have been examined for their total organic carbon (TOC) values together with their carbon, nitrogen, and iron isotope ratios. Carbon isotope stratigraphy (d13Corg and d13Ccarb) allows accurate recognition of the strata that record the oceanic anoxic event, in some cases allowing characterization of isotopic species before, during, and after the OAE. Within the black shales formed during the OAE, relatively heavy nitrogen isotope ratios, which correlate positively with TOC, suggest nitrate reduction (leading ultimately to denitrification and/or anaerobic ammonium oxidation). Black...

  17. Miocene Mediterranean Nd, Sr, C and O isotope composition

    Kocsis, C; Vennemann, Torsten W; Fontignie, Denis; Baumgartner, C; Montanari, Alessandro; Jelen, Bogomir
    Isotopic compositions of marine sediments and fossils have been investigated from northern basins of the Mediterranean to help constrain local oceanographic and climatic changes adjacent to the uplifting Alps. Stable C and O isotope compositions of benthic and planktonic foraminifera from the Umbria-Marche region (UMC) have an offset characteristic for their habitats and the changes in composition mimic global changes, suggesting that the regional conditions of climate and the carbon cycle were controlled by global changes. The radiogenic isotope composition of these fossil assemblages allows recognition of three distinct periods. In the first period, from 25 to 19 Ma, high...

  18. (Table 2) Stable carbon and oxygen isotope composition of foraminifera from the Umbria-Marche composite section

    Kocsis, C; Vennemann, Torsten W; Fontignie, Denis; Baumgartner, C; Montanari, Alessandro; Jelen, Bogomir

  19. (Table 1b) Biostratigraphy of western Monferrato area

    Kocsis, C; Vennemann, Torsten W; Fontignie, Denis; Baumgartner, C; Montanari, Alessandro; Jelen, Bogomir

  20. (Table 1a) Biostratigraphy of Umbria-Marche composite section

    Kocsis, C; Vennemann, Torsten W; Fontignie, Denis; Baumgartner, C; Montanari, Alessandro; Jelen, Bogomir

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