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They provide a more precise way to examine radiocarbon ages of organic material for the entire 11,000-53,000-year time range.A new series of radiocarbon measurements from Japan's Lake Suigetsu will give scientists a more accurate benchmark for dating materials, especially for older objects, according to a research team that included Oxford University's Radiocarbon Accelerator Unit.For example, archaeologists should now be able to pinpoint more accurately the timing of the extinction of Neanderthals or the spread of modern humans into Europe.At the Oxford Radiocarbon Accelerator Unit, Professor Christopher Ramsey with his doctoral student Richard Staff and chemist Dr Fiona Brock worked with two other radiocarbon laboratories (the NERC facility at East Kilbride, Scotland, and Groningen in the Netherlands) on the radiocarbon record from the lake.
Each sample is prepared in the same way as for a micropalaeontological analysis.
Fine-grained carbonate and total carbonate also have greater ages than total organic carbon, but the age differences are le s than those of foraminiferal carbonate.
Greater ages of carbon extractable with benzene are typical in nearshore basins and are attributed largely to redeposited tar from known nearshore seeps.
The archaeologists record and analyze the changes in types and styles of human-made items from different levels according to the principle explained below.
Sediments are usually laid down in horizontal beds.
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