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1 results

  • Electron spin resonance optical dating of marine, estuarine, and aeolian sediments in Florida, USA

  • Kevin E. Burdette, William J. Rink, David J. Mallinson, Guy H. Means, Peter R. Parham
  • Journal:
    Quaternary Research / Volume 79 / Issue 1 / January 2013
    Published online by Cambridge University Press:
    20 January 2017, pp. 66-74

  • For the first time, electron spin resonance optical dating (ESROD) has been conducted on littorally transported and aeolian siliciclastic sediments in Florida. ESROD utilizes light-sensitive radiation-sensitive defects at silicon sites that have been replaced by aluminum and titanium atoms to give rise to a time-dependant signal. These defects saturate at higher levels of radiation dose, compared to optically stimulated luminescence, and therefore extend the optical dating range back into the millions of years. Our results show that the Trail Ridge Sequence is a multi-depositional unit that began deposition around 2.2 Ma and continued until 6 ka. The Osceola Cape, of the Effingham Sequence, was deposited around 1.5 Ma, and the Chatham Sequence was a multi-depositional terrace with at least three events preserved.