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Fiona graduated with a degree in chemistry from the University of Manchester before completing a Ph D and postdoctoral research in biogeochemistry at the Universities of Bristol and Cardiff.Fiona was the radiocarbon laboratory chemist at the Research Laboratory for Archaeology & the History of Art at Oxford University for 10 years, where she developed and applied methods for radiocarbon dating a wide range of materials including bone collagen, charcoal, parchment, pollen, and sediments.
Those identified ABSTRACT A range of pretreatment methods was applied to 6 known-age historical parchments to investigate the most suitable methods for effectively removing contamination and ensuring accurate radiocarbon dates while minimizing unnecessary destruction of potentially valuable historical documents. Along with a new program of AMS radiocarbon measurement, varve counting is being carried out using two different techniques: i) thin section microscopy and ii) high-resolution X-ray fluorescence and X-radiography.
The high quality genome recently determined from a Neandertal phalanx from layer 11.4 of the East Gallery revealed that just as Neandertals and Denisovans had contributed DNA to AMHs, Neandertals had contributed DNA to Denisovans 5. © 2013 by the Arizona Board of Regents on behalf of the University of Arizona. published the unprecedented report of Arctic lupine (Lupinus arcticus Wats., Fabaceae) plants grown from seeds of presumed Pleistocene age [&gt;10 000 yr before present (bp)].
This suggests that Denisovans and Neandertals may have inhabited the Altai in close chronological proximity to one another, and even perhaps co-existed here periodically 4,5. These seeds were recovered from an ancient rodent burrow in frozen silt ...
This is highlighted by the exceptional preservation state of ancient DNA molecules in some of the bones recovered at the site. Since the Lake Suigetsu sediment is annually laminated (varved) for much of its depth it is suitable for extending the terrestrial radiocarbon calibration model up to 50 kyr BP. Nadeau, (2005), Radiocarbon calibration curve spanning 0 to 50,000 years bp based on paired 230Th/234U/238U and 14C dates on pristine corals, Quaternary Science Reviews 24 H. van der Plicht, (2000), Atmospheric radiocarbon calibration beyond 11,900 cal BP from Lake Suigetsu laminated sediments, Radiocarbon 42(3) P.
The Denisovan phalanx (Denisova 3), for instance, contained 70% endoge-nous DNA yielding a high coverage genome (30x) 7. However, the data presented by Kitagawa & van der Plicht (2000) significantly diverged from alternative, marine-based calibration datasets, due to gaps in the sediment profile and varve counting uncertainties (Staff et al., 2009).