• A Post-Chernobyl Grazing Economy—North Wales in the Second Year and Beyond

      Mooney, Sian; Kerr, William A. (Society for Range Management, 1989-08-01)
    • Carbon Isotope Variations and Chronology of the Last Glacial-Interglacial Transition (14-9 ka BP)

      Turney, Chris M.; Harkness, Douglas D.; Lowe, J. J. (Department of Geosciences, The University of Arizona, 1998-01-01)
      We present delta-13C data from both bulk organic sediment samples and terrestrial plant macrofossils from five high-resolution sedimentary sequences from the United Kingdom from which extensive multiproxy data sets have been obtained. These span the last glacial-interglacial transition. Chronological control has been provided by radiocarbon dating and/or tephrochronology. The results demonstrate that significant shifts in bulk organic delta-13C can be identified at key climatic transitions in most of the sites. The data are affected by site-specific influences that restrict their use as chronological markers. However, terrestrial plant macrofossil records are more consistent and reveal shifts that appear to be synchronous and which therefore offer a basis for interregional correlation as well as significant paleoenvironmental information.
    • Glasgow University Radiocarbon Measurements IX

      Campbell, J. A.; Baxter, M. S. (American Journal of Science, 1979-01-01)
    • National Physical Laboratory Radiocarbon Measurements V

      Callow, W. J.; Hassall, Geraldine I. (American Journal of Science, 1968-01-01)
    • Nuclear Accidents and Rangelands: The Effect of Chernobyl on the Grazing Economy of North Wales

      Kerr, William A.; Mooney, Sian (Society for Range Management, 1988-02-01)
    • Radiocarbon and Thermoluminescence Studies of the Karst Pipe Systems in Southwest England and South Wales

      Pazdur, Mieczysław F.; Bluszcz, Andrzej; Pazdur, Anna; Morawiecka, Iwona (Department of Geosciences, The University of Arizona, 1995-01-01)
      Paleokarst forms in raised beach deposits of Southwest England and South Wales and generally known as "pipes" were dated by 14C and thermoluminescence (TL) methods. Current geological opinion is that these pipes are features that developed under the cover of periglacial-solifluctional deposits due to periglacial conditions prevalent in the Late Devensian. In the present study, TL was used to determine the age of quartz grains forming the raised beaches. 14C ages were obtained from carbonate cements within sandrock and on the pipe walls. TL ages measured for quartz grains separated from sandrock samples are older than 80 ka BP, whereas the corresponding TL dates obtained from the sandy material of pipe infills center around 40 ka BP. All carbonates yielded finite apparent 14C dates that range from ca. 45 ka BP to 27 ka BP for sandrock. The apparent 14C dates obtained on carbonate cements from the pipe walls fall into two groups, one ranging from 30 ka BP to 22 ka BP and the other from 15 ka BP to 7 ka BP. On the basis of geochemical considerations, we conclude that the sandrock cements formed between 35 and 25 ka BP and pipe walls cemented between 30 and 2 ka BP with a break during the climate deterioration caused by last ice sheet advance.
    • Scottish Universities Research and Reactor Centre Radiocarbon Measurements IV

      Harkness, D. D. (American Journal of Science, 1981-01-01)