Dating archaeology ppt high end speed dating sydney

Kris Hirst Definition: Radiocarbon dating uses the amount of Carbon 14 (C14) available in living creatures as a measuring stick.

dating archaeology ppt-86

So, for example, if a tree was used as a support for a structure, the date that tree stopped living (i.e., when it was cut down) can be used to date the building's construction date.Studies have indicated that the amount of carbon in the atmosphere has not remained constant, and beginning about 1500 BC, dates provided by radiocarbon are too recent.These dates become farther off the older the time is indicated.Calibration of radiocarbon dates to offset the error is accomplished by a fairly complicated set of formulas, but they primarily use comparison to dendrochronology dating referents.Because of the rates of decay, radiocarbon dating is not useful for sites older than 50,000 years old.

Archaeological sites older than that period must rely on alternative means of dating.For more detailed information on this and other dating techniques used in archaeology, see the Dating in Archaeology Short Course.This glossary entry is part of the Dictionary of Archaeology.Prior to the development of radiocarbon dating, it was difficult to tell when an archaeological artifact came from.Unless something was obviously attributable to a specific year -- say a dated coin or known piece of artwork -- then whoever discovered it had to do quite a bit of guesstimating to get a proper age for the item.The excavator might employ relative dating, using objects located stratigraphically (read: buried at the same depth) close to each other, or he or she might compare historical styles to see if there were similarities to a previous find.