Equivalent dose distributions from single grains of quartz at .
WEBJul 1, 2008 · 1.. IntroductionSingle grain optical dating of quartz grains from the postHowiesons Poort (HP), late and final Middle Stone Age (MSA) sediments at Sibudu, KwaZuluNatal, South Africa reported by Jacobs et al. (2008) revealed that only one of the 14 samples had an equivalent dose (D e) distribution consistent with all grains being part .