Absolute dating utilizes one or more of a variety of chronometric techniques to produce a computed numerical age, typically with a standard error.Different researchers have applied a variety of absolute dating methods directly to petroglyphs or to sediments covering them, including AMS (accelerator mass spectrometry) radiocarbon, cation ratio, amino acid racemization, OSL (optically stimulated luminescence), lichenometry, micro-erosion and micro-stratification analysis of patina. These techniques have yielded mixed results in terms of reliability and feasibility, but, in any case, none has been applied to date in Saudi Arabia. Though this subject is somewhat complex and intricate, this reviewer found the text straightforward and easy to read.' Choice (May 1998) `This will be a standard reference work.' Antiquity (March 1998) `The book is well suited for archaeologists, dating specialists interested in techniques with which they do not directly work, and advanced undergraduate and postgraduate students in archaeology and Quaternary studies.Dating is as critical to understanding soil formation and sedimentary deposition as it is to archaeology, and many of the same issues and problems apply.When this occurs bodily tissues can be preserved, but it as extremely rare occurrence. When an organic item is buried in sediment, heat and pressure causes the release of hydrogen and oxygen, which leaves behind a carbon residue.
To progress, it is essential to apply the second type, or relative, dating.Dating technqies can be split into two groups: When dating sediments the source of the organic matter and the likelihood of any age discrpancy between the material and the sediments in which they are found need to be considered.For example, sediments can contein organic materials eroded and redeposited from older sediments, in this case the organic matter will be considerably older than the sediments with which it is associated.The term refers to the fact that an approximate date can be inferred by comparison with something else of known age.Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.