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When humans consume foods from different radiocarbon reservoirs offset in age to the atmosphere, inaccuracies in the 14C date of bone collagen can occur.
Mesolithic human skeletons from the Iron Gates section of the Lower Danube Valley have yielded reservoir offsets of up to ~500 yr.
Plant eating animals (herbivores and omnivores) get their carbon by eating plants.
All animals in the food chain, including carnivores, get their carbon indirectly from plant material, even if it is by eating animals which themselves eat plants.
This fact should always be remembered when using radiocarbon dates.