Method of historical dating
For example, astronomy uses some relative dating methods to calculate the age of the surface of planets by methods other than its materials, especially where physical samples are impossible to acquire.
Sometimes, we see them used in forensic science such as criminal investigations to determine the time and date a crime was committed, commonly when dating the time of death of a homicide victim.
Amino Acid Dating is used to acquire dates numbering in the hundreds of thousands, although some calibration is required to account for local temperature conditions. Paleomagnetic / Archaeomagnetic dating: By studying the changes in the magnetic signature of deposits, artefacts, but particularly soil disturbance, archaeologists and paleontologists can determine precise dates.
There are two ways a magnetic signature forms - firstly through extreme heat such as in pottery production or hearth fires.
These energy levels are measured against what they should be if they had not been interfered with and we are able to obtain a date of the intervention.
This is used in archaeological and anthropological contexts (7) in areas where radiocarbon dating is problematic such as dating post AD1700 and where dates from RC14 is anomalous or lacks data. Potassium-argon dating: Typically used in geology and geochronology, K-Ar dating has a minimum age of around 100,000 years ago (but can be problematic when examining material close to this earliest date) up to a top end of around 4.5 billion years.
All dating methods today can be grouped into one of two categories: .
For further details, see uranium-lead dating section below.Ever since The Enlightenment, and possibly even before that, researchers have attempted to understand the chronology of the world around us, to figure out precisely when each stage in our geological, biological and cultural evolution took place.Even when the only science we had to go on was religious literature and the western world believed the world was created in 4004BC (1), scholars tried to figure out when each biblical event took place, to define a chronology from savagery to civilization, from creation to the first animal, then to the emergence of the first people.Similarly, herbchronology examines the growth rings in perennial plants other than trees to come up with the same information.Such rings can tell us the year the plant or tree was cleared; it can also shed light on geological or environmental events that alter the environment.
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Lead-lead dating: Another method that studies the chemical attributes of rocks, it's largely been superseded by uranium-lead dating in geological studies.