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In this study, we collected palaeosoil samples from pits dug at archaeological sites in China.A new, improved method was developed to extract phytoliths from soils.We compared the dating of phytoliths and other materials (e.g., charcoal and plant seeds) recovered at the same depth from seven pits at six archaeological sites in China.The estimated ages of the phytoliths and other materials were generally consistent, except for one outlier.This process of curve-fitting has come to be called "wiggle-matching." In this paper, we look at the requirements for getting good precision by this method: sequence length, sampling frequency, and measurement precision.We also look at 3 case studies: one a piece of wood which has been independently dendrochronologically dated, and two others of unknown age relating to archaeological activity at Silchester, UK (Roman) and Miletos, Anatolia (relating to the volcanic eruption at Thera).In most dating applications, however, we have larger numbers of 14C measurements and we wish to relate those to events in the past.
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Further testing of phytolith dating at archaeological sites is required to confirm whether or not phytolith dating can be influenced by the carbon content of old soils.
Methods for performing such tests are discussed here along with other methods of diagnosing possible problems with statistical models of this kind.
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