There are several dating methods that help archaeologists figure out how old objects are. In fact, there are so many that it would be impossible to describe them all in one article. Hence, this post will discuss some of the most widely-used dating methods — stratigraphy, typology, seriation, and radiocarbon dating — and we will cover the rest in subsequent articles. There are two overarching classes of dating methods: relative and absolute. Relative dating methods cannot determine the exact age of an object, but only which finds are older or younger than others.
Luminescence dating - Wikipedia
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Melissa graduated from NC State University with a Bachelor's Degree in geology in and currently works as a lab technician. Figuring out the geologic history of an area seems like a daunting task, but there are several strategies that geologists use to figure out which rocks are older than other rocks, and what geologic processes occurred in a particular order. Geologists can numerically date certain rocks by using the radioactive decay of elements trapped in rocks or minerals to figure out their exact age. However, these radioactive isotopes aren't always present in a rock, so geologists must use context clues to build a calendar called a geologic timescale of when each rock layer in a formation was created.
Luminescence dating including thermoluminescence and optically stimulated luminescence is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past. The method is a direct dating technique , meaning that the amount of energy emitted is a direct result of the event being measured. Better still, unlike radiocarbon dating , the effect luminescence dating measures increases with time. As a result, there is no upper date limit set by the sensitivity of the method itself, although other factors may limit the method's feasibility.