Charred bones are better preserved and are therefore relatively more reliable. Charcoal is best material specially if derived from short live plants. How to collect samples: While collecting samples for radio carbon dating we should take utmost care, and should observe the following principles and methods.
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Sample should be collected from and undisturbed layer. Deposits bearing, pit activities and overlap of layers are not good for sampling. The excavator himself should collect the sample from an undisturbed area of the site which has a fair soil cover and is free of lay water associated structures like ring wells and soakage pits. Samples which are in contact or near the roots of any plants or trees should not be collected because these roots may implant fresh carbon into the specimens.
Handling with bare hands may add oil, grease, etc to the sample. Therefore, it is better to collect samples with clean and dry stainless steel sclapels or squeezers.
It may also be collected with the help of glass. Stainless steel, glass, polythene and aluminium are free from carbonatious organic material.
Therefore sampling should be done with such material only. Samples should be sundried before pacing in aluminium thin foils and placed in a glass jar or secured safely in thick polythene covers.
Before pacing the soil should be removed while it is wet at the site. Method of Sample Recording: Before removing the sample from the site we should note down the data or the environment of the sample. We have to fill the data sheets, which should be done at the time of sampling and should be submitted along with the sample to the dating laboratory. These sheets require data on environment and stratigraphy of the sample, and archaeological estimates of its dating.
This data help in obtaining and objective interpretation of dates. Limitation and Errors of C Dating: There are a number of technical difficulties inherent in this method of dating. The first difficulty is that the quantity required for a single determination is comparatively large.
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It will be difficult to obtain sufficient quantities of samples, especially in the case of valuable museum specimens. The second difficulty is that the radio active decay does not take place at a uniform rate but is a random process, and is therefore, governed by the laws of statistical probability.
Another difficulty that has to be taken into serious consideration is the possibility of uneven distribution of radio carbon in organic matter. If the specimen is analyzed after having been exposed to contamination by carbon compounds of an age younger than its own, radio carbon age is liable to be reduced.
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The best results can be obtained from specimens, which were preserved under very dry conditions, or even enclosed in rock tombs of the like. Very dangerous contamination is done, very often, by the growth of fungus and bacteria on the surface of the specimen which even when removed from the specimen may falsify its actual age.
Though there are some drawbacks and technical difficulties, the radiocarbon method is a reliable, efficient and most useful method of dating the archaeological specimens. We are helpless in the case of contamination done by the natural agencies in the past, but we can overcome association dating archaeology of the difficulties by paying sufficient care and attention while collecting the samples. It is the duty of an archaeologist to study with care the condition of preservation of specimens submitted for analysis and, in fact, to submit only specimens that can be regarded as fool-proof as is possible in the associations dating archaeology.
A major application of dendrochronology in archaeology, as a tool for establishing dates from the samples of wood and articles made out of wood is not only in working out primary chronologies but also in cross checking the already known dates by link methods.
Often, the tree-ring analysis from a site can give strong clues about the length of occupation, certain periods of building or repair activities at the site.
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Another application of tree-ring analysis is the inference of past environmental conditions, which is extremely useful to the archaeologists. The modern science of dendrochronology was pioneered by A.
Tree ring analysis is based on the phenomenon of formation of annual growth rings in many.