The ancient Gulf of Latmos is an iconic example of a dynamic landscape and humankind's historical relationship with it. Using extensive new primary data and original models for calibrating ...radiocarbon dates in transitional lagoon environments, we demonstrate that Lake Bafa (or Bafa Gölü, in Turkish) formed at a much earlier date than previously thought. In questioning the logical process by which previous dates were achieved, we re‐examine the relationship between sedimentological data, archaeology and written history. We reassert the need to establish independently dated environmental data sets as the foundation of regional studies as distinct from archaeological and historical interpretive processes. We conclude that Lake Bafa slowly transitioned to become an isolated lagoon sometime between the end of the second millennium B.C. and end of the first millennium B.C.; becoming a fully closed brackish lake during the second millennium A.D. This marks a major shift in our understanding of the nature of human occupation and activity here during the last four millennia but also in the way we date ancient lagoons and integrate historical and environmental data in general.
Revision of some ages for the Rotoehu Ash Whitehead, Neil; Ditchburn, Robert
New Zealand journal of geology and geophysics,
19/9/1/, Letnik:
37, Številka:
3
Journal Article
Recenzirano
Odprti dostop
Previously published U/Th disequilibrium data for the Rotoehu Ash suggest an age of 71 ± 6 ka, in accord with whole rock K/Ar ages (64 ± 4 ka). However, examination of the internal ratios of isotopes ...in the U/Th decay series shows that the age is probably erroneous. Examination of other age data derived using various techniques gives further revised dates: 42.9 ±7.8 (ESR) and 35.1 ± 2.8 (
14
C). The latter is now based on four, non-infinite, tightly clustered dates, but probably needs an upward calibration correction. More work is needed to resolve the continuing discrepancies. We also present eight new
230
Th/
232
Th analyses for rhyolites and ignimbrites-the mean and standard deviation are 0.705 ± 0.076.
Les cinq faunules de mollusques analysées montrent de la base vers le sommet de la stratigraphie une différenciation progressive des associations. Celle-ci met en évidence, à partir d'un milieu ...initial steppique, l'extension du couvert végétal. Cette amélioration climatique répercutée sur la malacofaune a la valeur de celle du début d'un interglaciaire.
Five land snails groups have been studied in stratigraphy on the Serre du Villard section and it appears a progressive différenciation from the base to the top. That means an evolution from an initial steppic environnment to a vegetation's increase. This climatic improvement, through the malacofauna study, is correlate with the beginning of an interglacial period.
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