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    Intrashell Radiocarbon Variability in Marine Mollusks

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    Author
    Culleton, Brendan J.
    Kennett, Douglas J.
    Ingram, B. Lynn
    Erlandson, Jon M.
    Southon, John R.
    Issue Date
    2006-01-01
    
    Metadata
    Show full item record
    Citation
    Culleton, B. J., Kennett, D. J., Ingram, B. L., Erlandson, J. M., & Southon, J. R. (2006). Intrashell radiocarbon variability in marine mollusks. Radiocarbon, 48(3), 387-400.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653633
    DOI
    10.1017/S0033822200038820
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    We demonstrate variable radiocarbon content within 2 historic (AD 1936) and 2 prehistoric (about 8200 BP and 3500 BP) Mytilus californianus shells from the Santa Barbara Channel region, California, USA. Historic specimens from the mainland coast exhibit a greater range of intrashell variability (i.e. 180-240 14C yr) than archaeological specimens from Daisy Cave on San Miguel Island (i.e. 120 14C yr in both shells). d13C and d18O profiles are in general agreement with the upwelling of deep ocean water depleted in 14C as a determinant of local marine reservoir correction (Delta-R) in the San Miguel Island samples. Upwelling cycles are difficult to identify in the mainland specimens, where intrashell variations in 14C content may be a complex product of oceanic mixing and periodic seasonal inputs of 14C-depeleted terrestrial runoff. Though the mechanisms controlling Delta-R at subannual to annual scales are not entirely clear, the fluctuations represent significant sources of random dating error in marine environments, particularly if a small section of shell is selected for accelerator mass spectrometry (AMS) dating. For maximum precision and accuracy in AMS dating of marine shells, we recommend that archaeologists, paleontologists, and 14C lab personnel average out these variations by sampling across multiple increments of growth.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200038820
    Scopus Count
    Collections
    Radiocarbon, Volume 48, Number 3 (2006)

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