When remains of living beings get buried into sediments and turn to fossils, the bacteria present in the soil breakdown the proteins and fats from the bones.
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The most common relative dating, association with bones of extinct fauna, association with certain pollen profiles, association with geological features such as beaches, terraces and river meanders, and the establishment of cultural seriations.
Cultural seriations are based on typologies, in which artifacts that are numerous across a wide variety of sites and over time, like pottery or stone tools.
He was also an enthusiastic amateur paleontologist.
In some workmen, knowing his interest in fossils, presented him with curious bone fragments that they had found while working in a gravel pit near the town of Piltdown.
dating can be carried out based on the fact that groundwater contains fluoride ions.
Items such as bone that are in the soil will absorb fluoride from the groundwater over time.
As the most electronegative element, it is extremely reactive, as it reacts with almost all other elements, except for helium and neon.
Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance.
Fluorite , the primary mineral source of fluorine which gave the element its name, was first described in ; as it was added to metal ores to lower their melting points for smelting , the Latin verb fluo meaning “flow” gave the mineral its name.