Example chronometric dating technique
Independent method of absolute dating in its own right.Rings become narrower with age, amount of growth affected by fluctuations in climate Sequence of tree-ring widths is perfectly unique to a sequence of growing seasons.-Limitations -Right species -Seasonal variation -Rings well preserved -Sample 1.deposit and can be no alter (no more recent) than the deposit itself Allows to date a field site by dating an artifact because of association Nitrogen, fluorine, uranium, collagen content, gradually reduced by process of chemical decay. Very variable, depends on site's chemical content as well.Cannot form a basis of absolute dating, but on an individual site, chem, dating can distinguish bone on different age found in apparent stratigraphic association Duration of different artifact styles that governs seriation Artifacts are arranged acc.Earth's magnetic field is constantly changing, iron particles take up permanently the earth's magnetic direction at time of firing clay structures.Can date sites with clay quite accurately, or when something is out of context. Date pottery and rocks that have been heated at about 500ºC or higher.2. HOWEVER: Very poor precision.-Electron traps set to zero when heated. Date minerals which have been exposed to light by several minutes' exposure to sunlight.)-Understand what it dates (what is the literary context? )-Be able to translate it to a meaningful date referable to our time system (can the calendar be anchored in our calendar system? The list has to be linked with our own calendar if it is not to remain a "floating chronology"3.
Measure of random error and refers to how often you arrive at the same answer for repeated dates (how often would you get the same answer? The closer the clusters of multiple answers, the more precise it is.
If the answers are very different from each other, then it is not precise.
Refers to smallest unit of time at which two dates can be distinguishable-My grandfather is an octogenarian, my grandmother is also an octogenarian. -You can only know if they fall within different decades worth of time.-E.g., standard deviation of one date that can fall into one category.
Drawback: some minerals don't capture sufficient amounts of sunlight, therefore are dated as older... Based on principle that when volcanic obsidian is fractured, it starts absorbing water from its surroundings, forming a hydration layer that can be measured.
No universally valid rate of growth or hydration rate. Does not give info about date of a rock engraving, but about the length of time that the rock surface in Q has been exposed since the geological even leading to dating.