US Geological Survey Radiocarbon Dates XIII

Abstract

This list contains the results of some measurements made between 1965 and 1973. Samples are counted in the form of acetylene gas, as previously, and ages computed on the basis of the Libby half-life, 5568 ± 30 years. The dates have not been corrected for fractionation by a δ13C measurement. The error listed, always larger than the one-sigma statistical counting error commonly used, takes into account possible fractionation in the laboratory and in nature and the variability experienced with replicate samples. We wish to thank Charles Oman for his technical assistance.

Late Quaternary environmental and landscape dynamics revealed by a pingo sequence on the northern Seward Peninsula, Alaska

“…Throughout the Holocene, thermokarst processes have continued to operate, gradually lowering the original land surface. Thermokarst lake formation during that time falls within the range of other published thermokarst lake basal dates for the Seward Peninsula (Spiker et al, 1978;Kaufman and Hopkins, 1985) and the circum-arctic (Walter et al, 2007;Reyes and Cooke, 2011). The age of the lowermost dated sample in unit D of 8370 AE 50 yr BP falls in the period of a pronounced early Holocene climate warming in NW North America (McCulloch and Hopkins, 1966;Detterman, 1970;Ritchie et al, 1983;, a time when thermokarst lake formation peaked in Alaska and other high latitude regions (Walter et al, 2007) and intense peatland formation occurred in Alaska (Jones and Yu, 2010).…”

Late Pleistocene and Holocene tephrostratigraphy of interior Alaska and Yukon: Key beds and chronologies over the past 30,000 years

“…6a). One date from Spiker et al (1978;W-2806) is reported in Hopkins (1988) as overlying the tephra. This date provides an additional constraint on the model although it is unclear how it relates to the tephra stratigraphically.…”

Bibliography of published radiocarbon dates for Alaska

“…al., 1961I Liu and Colermn, 1981ISGS Tamers, 1966IVIC Tauber, 1973K Tauber, 1968K Tauber, 1964K Tauber, 1962K Tauber, 1960K Olson and Broecker, 1961L Olson and Broecker, 1959L Hubbs and Bien, 1967LJ Hubbs, et. al., 1965LJ Crane and Griffin, 1972M Crane and Griffin, 1968M Crane and Griffin, 1964M Crane and Griffin, 1961M Spiker, et. al., 1978W Spiker, et.…”

“…al., 1964Sainsbury, et. al., 1965Schweger, 1982Schweger, 1976Sellmann and Brown, 1973Spiker, et. al., 1978 Stuckenrath and Mielke, 1972Stuiver and Deevey, 1961Stuiver, et.…”

“…al., 1965Matthews, 1974bMcCulloch and Hopkins, 1966 MeCulloch, et. al., 1965Rubin and Alexander, 1958Sainsbury, 1967Sancetta and Robinson, 1983Spiker, et. al., 1978Stuiver, 1969 Stuiver, et v al., 1963Weber and Pewe, 1970Weber and Pewe, 1961 East-Central Ager, 1975 Ager, 1972 Blackwell, 1965 Brown and Kreig, 1983Brown, et.…”