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For example, beads closely resembling those from the temple repositories at Cnoss and dating from C.1600 B.
C were found in a late context (Period V) at Harappa. By noting the association of these beads it has been possible to trace a archaeological datum line across Indian sub-continent and Mesopotamia.
This closely agrees with the fact that the seals from Indus Valley style from Ur, Kish and Tell Asmar and other sites fall within the range of 2500-1500 B. When a group or type of objects are found together under circumstances suggesting contemporanity they are said to be associated.
It is nearly always association with other phenomena that gives a first clue as to the use, the age and chronological attribution of a potential datum, but age at least may sometimes be inferred from position in a geological deposit or a layer of peat.
Clay tablets found in West Asia contain inscriptional evidence with regard to the occurrence of a solar eclipse.
Specialists in the field of astronomical research placed this solar eclipse as on 15 June 763 B. The Almanac belonging to Maya culture of Central America helped in dating several important sites accurately on the basis of astronomy.
Even when the absolute dates are available, we have to supplement the information with relative dating.
The various methods of relative dating are; This method depends on the common observation that the height of the habitational area increases as the people continue to live at the same place.
But, for a single culture site the method is quite reliable.At that time the radioactive disintegration takes over in an uncompensated manner. only half the C-14 will remain after the half-life period.In the disintegration process the Carbon-14 returns to nitrogen emitting a beta particle in the process.The quantity of the C-14 remaining is measured by counting the beta radiation emitted per minute per gram of material.Modern C-14 emits about 15 counts per minute per gram, whereas Carbon-14 which is 5700 years old, emits about 7.5 counts per minute per gram.