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The new archaeological results seem compatible with the younger date adduced by the geneticists.
I'll admit I laughed with rueful recognition at a scene in "30 Rock" when Tina Fey's Upper West Side-dwelling chareacts reacts with dismay to a late-night party invitation proffered by a younger date.
The analysis, by David Reich, Nick Patterson and colleagues at the Broad Institute in Cambridge, Mass., sets up a serious conflict between the date of the split as indicated by fossil skulls, about 7 million years ago, and the much younger date implied by genetic analysis, as late as 5.4 million years ago.
Yet a number of researchers argued that the bone's shape suggested a younger date, and that it might have been deposited much later than the volcanic layer.
Moreover, by updating the M31 phylogenetic tree, a much younger date was recently estimated by Wang et al. (2011) for M31a1 (−7,960 ± 3,910 years), suggesting that Andamanese arrived from Southeast Asia across a land-bridge around the Last Glacial Maximum (LGM), but that this haplogroup originated in northeast India.
The European polecat likely diverged from the steppe polecat 1.5 million years ago based on IRBP, though cytochrome b transversions indicate a younger date of 430,000 years.
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In a chronology based on younger dates for the flutes, it was supposed that modern humans had waited for better weather before heading through the Danube.
Hand axes found at Didwana, Rajasthan, similar to those from the Shiwalik Range, yield slightly younger dates of about 400,000 years ago.
Consequently, all plant fragments showed the same or younger dates than those of the organic sediments, fragile organic materials (leaves and seeds), and age of a tephra.
Three other teams have come up with later dates of about 2.2 million to 2.6 million years, although they all considered the younger dates to be more likely.
In Central Asia, similar expansion times are found for the Y chromosome (16,000 and 36,000 years, depending on the model), while slightly younger dates are obtained for mtDNA (26,000 and 54,000 years).
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