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03-May-2019 01:53

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Thermoluminescence: Silicate rocks, like quartz, are particularly good at trapping electrons.Researchers who work with prehistoric tools made from flint — a hardened form of quartz — often use thermoluminescence (TL) to tell them not the age of the rock, but of the tool.Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.

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A submethod within biostratigraphy is faunal association: Sometimes researchers can determine a rough age for a fossil based on established ages of other fauna from the same layer — especially microfauna, which evolve faster, creating shorter spans in the fossil record for each species.

Unlike observation-based relative dating, most absolute methods require some of the find to be destroyed by heat or other means.

Magazine illustrators included Francis Attwood, Dean Cornwell, Harrison Fisher, and James Montgomery Flagg.… continue reading »

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