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In addition, the age of the layers for the ancient fossilised nest (UP1B) increased with distance towards the core from Layer 1; at 0.24 Gy, Layer 2; 0.44 Gy, Layer 3; 0.84 Gy and finally the core; at 4.50 Gy, these D equate to ages of 160, 280, 600 years and 3.09 kyrs respectively, with the inner grains containing an average of 4.5 Gy more dose.
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