A complementary, two-method spherical approach to direction-based archeomagnetic dating

We present a two-method spherical approach to archeomagnetic dating based on directional variations of the geomagnetic field after vector treatment all data, including individual in situ structure-level data used calculate reference variation curve and direction be dated. In this paper, for France was determined from compilation acquired kiln structures using sliding window technique which varying durations time shifts between windows are fixed according temporal distribution as well bivariate extension Fisher's statistics. The first method involves identifying interval(s) dated is closest mean directions that define curve. angles directions, Fisher probability density function allow us derive coincidence curve, it possible estimate 95% level-based interval. second determination an date statistically identical at confidence level. This much more restrictive than previous because requires excellent agreement test obtain result, while only relative proximity. Using examples dating, we show these two methods complementarity should applied jointly account some limitations inherent particularly due dispersion data.