Originating from the Post-Zarubintsy cultures and often considered the oldest Slavic culture, the Kiev culture functioned during the later Roman periods (end of 2nd through mid-5th century) north of the vast Chernyakhov culture territories, within the basins of the upper and middle Dnieper, Desna and Seym rivers. The archeological cultural features of the Kiev sites show this culture to be identical or highly compatible (representing the same cultural model) with that of the 6th-century Slavic societies, including the settlements on the lands of today's Poland. The Kiev culture is known mostly from settlement sites; the burial sites, involving pit graves, are few and poorly equipped. Not many metal objects have been found, despite the known native production of iron and processing of other metals, including enamel coating technology. Clay vessels were made without the potter's wheel. The Kiev culture represented an intermediate level of development, between that of the cultures of the Central European Barbaricum, and the forest zone societies of the eastern part of the continent. The Kiev culture consisted of four local formations: The Middle Dnieper group, the Desna group, the Upper Dnieper group and the Dnieper-Don group. The general model of the Kiev culture is like that of the early Slavic cultures that were to follow and must have originated mainly from the Kiev groups, but evolved probably over a larger territory, stretching west to the base of the Eastern Carpathian Mountains, and from a broader Post-Zarubintsy foundation. The Kiev culture and related groups expanded considerably after 375 AD, when the Ostrogothic state, and more broadly speaking the Chernyakhov culture, were destroyed by the Huns.[c] This process was facilitated further and gained pace, involving at that time the Kiev's descendant cultures, when the Hun confederation itself broke down in the mid-5th century.