Archaeologists have identified several early culture-complexes, including the Cucuteni culture (4500 to 3500 BC), Starcevo culture (6500 to 4000 BC), Vinča culture (5000 to 3000 BC), Linear pottery culture (5500 to 4500 BC), and Ezero culture (3300—2700 BC). The Eneolithic Varna culture in Bulgaria(4600-4200 BC radiocarbon dating) produced the world's earliest known gold treasure and had sophisticated beliefs about afterlife. A notable set of artifacts are the Tărtăria tablets found in Romania, which appear to be inscribed with proto-writing.