Celts in Transylvania arrived in northwestern Transylvania in around 400–350 BC as part of their great migration eastwards. When Celtic warriors first penetrated these territories, the group seem to have merged with the domestic population of early Dacians and assimilated many Hallstatt cultural traditions. The second half of the 4th century BC saw the Middle La Tène Celtic culture emerge in north-western and central Dacia, a development reflected especially in burials of the period. Celtic artifacts dating to this time have been discovered at Turdaş, Haţeg and Mediaş in modern-day Romania. By 1976, the number of Celtic sites found in Transylvania had reached
Transylvania Mounds and in height. The site underwent limited archaeological testing in the 1960s. These tests dated occupation of the site about 700–1200 CE during the Coles Creek period. Other ceramics discovered at the site were dated to 1200–1541 during the Plaquemine Mississippian period. A series of radiocarbon samples returned dates between 1048 and 1411 CE. These investigations prompted archaeologists to use the Transylvania site as the type site for the "Transylvania Phase (1500-1680 CE)" of the local Tensas Basin Plaquemine Mississippian chronology. When the site was mapped in 2000 investigators were able to identify six remaining mounds. Transylvania Mounds Transylvania Mounds