added by archaeologs Late Mesolithic and Early Neolithic settlement located in Latvia, Russia. The Mesolithic levels had a rich bone and antler industry with radiocarbon dates of c 5200-4800 BC. An Early Neolithic occupation contained Osa type pottery and similar bone tools, with radiocarbon dates of 3950-3800 BC. There was also a thin layer of the Pit-Comb Ware group, with a radiocarbon date of c 2050 BC.