Stratigraphic dating is based on the principle of depositional superposition of layers of sediments called strata.
This principle presumes that the oldest layer of a stratigraphic sequence will be on the bottom and the most recent, or youngest, will be on the top.
If archaeologists know how pottery styles, glazes, and techniques have changed over time they can date sites based on the ratio of different kinds of pottery.
This also works with stone tools which are found abundantly at different sites and across long periods of time.
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.
Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.
The application of the described chemical dating method made it possible to discover the first Swedish and the oldest dated Scandinavian finds of wild horse, and one of the oldest finds of domestic cattle in Scandinavia.
The relationship between fluorine and silicon provides new information about the diagenesis of the inorganic phase of bone.
Many different techniques can be used to measure bone fluoride content, but measurement by ion selective electrode is the easiest and simplest method available today.
Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object.
The earliest-known hominids in East Africa are often found in very specific stratigraphic contexts that have implications for their relative dating.
There are two main methods determining a fossils age, relative dating and absolute dating.