Relative chemical dating
In addition, local climatic and environmental conditions determine whether fossilization will occur, so that there is differential preservation among different locations.Moreover, the rock sequences are not always complete in all places, so certain periods cannot be investigated.The other method is “Relative Dating” which gives an order of events without giving an exact age (1): typically artefact typology or the study of the sequence of the evolution of fossils.There are three carbon isotopes that occur as part of the Earth's natural processes; these are carbon-12, carbon-13 and carbon-14.The DNA can then be analyzed to learn more about the organism.Any living organism can become fossilized, including bacteria, plants, and animals.Fossils are found in a variety of rock, but most often in sedimentary rock, which forms from the accumulation of sediments.The replacement of organic materials with inorganic materials is not always complete, as DNA is sometimes preserved within the fossil.
While early hominids likely lived throughout the entire continent, it is in the specific regions where paleoanthropologists have had the most success at discovering fossils.
Other relative methods include chemical dating, biostratigraphic or faunal dating, and cultural dating.
Chemical dating, such as fluorine dating, compares the relative amounts of absorbed fluorine in bones from the same site.
Absolute dating uses chemical and physical processes to provide a date range for an object, fossil, or site.
Absolute methods include radiometric and non-radiometric methods.