Chemical enrichment in the early galaxy

New, precise abundance data for a large number of elements in a growingsample of extremely metal-poor stars are accumulating from the new 8-mtelescopes. Combined with theoretical models, these results advance ourunderstanding of the first generations of stars, whose nucleosynthesisproducts are fossilised in the oldest stars we see today and thus giveclues to the earliest phases of evolution in the Galaxy. In particular,the heaviest elements give us insight into the different neutron capturemechanisms and the stellar sites where such elements could be produced.They also afford an independent way to determine the age of the Galaxy,by radioactive chronology.