Dealing outliers offsets radiocarbon dating
There is also a full treatment of outlier analysis for samples which are all of the same age which takes account of the uncertainty in the calibration curve.All of these Bayesian approaches can be used either for outlier detection and rejection or in a model averaging approach where dates most likely to be outliers are downweighted.However, the models most often used make a number of assumptions that may not always be appropriate.In particular, there is an assumption that all of the 14C measurements are correct in their context and that the original 14C concentration of the sample is properly represented by the calibration curve.Another important subject is the consistent treatment of correlated uncertainties between a set of measurements and the calibration curve.This has already been discussed by Jones and Nicholls (2001) in the case of marine reservoir offsets.
A., Payne, R., Bronk Ramsey, C., Bryant, C., Brock, F., Schlolaut, G., Marshall, M., Tarasov, P., Lamb, H., SG06, a fully continuous and varved sediment core from Lake Suigetsu, Japan: stratigraphy and potential for improving the radiocarbon calibration model and understanding of late Quaternary climate changes Kossler A, Tarasov P, Schlolaut G, Nakagawa T, Marshall MH, Brauer A, Staff RA, Bronk Ramsey C, Bryant CL, Lamb HF, Demske D, Gotanda K, Haraguchi T, Yokoyama Y, Yonenobu H, Tada R.
In practice in any analysis of dates some are usually rejected as obvious outliers.
However there are Bayesian statistical methods which can be used to perform this rejection in a more objective way (Christen, 1994b) but these are not often used.
His main research has been in the application of physical sciences to archaeology and the environmental sciences and in particular in the use of radiocarbon isotope studies: As director of the Oxford Radiocarbon Accelerator Unit, he has been involved in many different archaeological projects.
These projects include those that are led from Oxford, and those that are collaborative with scholars elsewhere.
His primary focus in recent years has been in the archaeology of the eastern Mediterranean (Aegean, Egypt and the Levant), and in the Paleolithic period (with Tom Higham).