  Dating is a key element for archaeologists. We propose a Bayesian approach to
provide chronology to sites that have neither radiocarbon dating nor clear
stratigraphy and whose only information comes from lithic arrowheads. This
classifier is based on the Dirichlet-multinomial inferential process and
posterior predictive distributions. The procedure is applied to predict the
period of a set of undated sites located in the east of the Iberian Peninsula
during the IVth and IIIrd millennium cal. BC.
