On many cemeteries, evidence of cremation were discovered, but they make only a few percent of the graves (Gomjenica near Prijedor, Petoševci, Dvorovi, Batković, Čelarevo, Novi Slankamen). Various objects, like iron knives, were buried next to some of the urns. At the Trnovica locality, near Zvornik, the urn was buried inside the much older, prehistoric mound. Unique way of burials appeared in time, consisting of stone mounds. With the diameter of or more, and grouped into the collections of several dozens, they are believed to contain cremated remains. Dated from the 8th to the 11th century, only few were examined. Sparse pieces of pottery, jewelry and personal items were discovered but the origin of the practice, and if they indeed were burial sites, remains unanswered.