These bulk sediment dates are presumed to be direct ageindicators for the speciments (e.g., pollen or macrofossils) which are actually being studied.
However, several recent studies have reinforced long-standing apprehensions concerning this presumption.
Very informative, I was investigating the ENSO effects on South Central America climate and wasn't sure of the relationship of the research between the radiocarbon dating and the use of Pollen determining the drought period.
The use of pollen fossilization or in the case of man's influence with deforestation and the species introduction was so telling!
I learned a lot in such a short span of time, Thanks!
Radiocarbon dating of bulk sediments has been the standard method for establishing chronologies in the studies of lake sediment cores which have contributed significantly to our knowledge of late Quaternary paleo-environments.
(Source) According to a 2006 report, Iranian archaeologists in "Burnt City" announced the unprecedented discovery of an artificial eyeball, dated to 4,800 years ago, in this historic site.In this study, we demonstrate for the first time the radiocarbon dating of pollen concentrate samples by accelerator mass spectrometry.The dates obtained by this method should provide more reliable radiocarbon chronologies for paleo-environmental studies than have been obtainable by bulk sediment dating.Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms.It is rapidly oxidized in air to form carbon dioxide and enters the global carbon cycle.