The retreat of the Scythians from Ciscaucasia and the arrival of the Sauromatian incomers into the Pontic Steppe in the late 6th century BC caused significant cultural changes in Scythia, giving rise to the Middle Scythian period or Classical Scythian period, which itself was a hybrid culture originating from a combination of a continuation of the material culture reflected in the Ciscaucasian Scythian burials with Sauromatian elements.
Among the changes in Scythia in this period was a significant increase in the number of monumental burials: it was from the Middle Scythian period that the largest number of Scythian burials in the Pontic Steppe were made, with the Scythian upper classes starting to bury their dead within the Pontic Steppe itself largely in the region of the rapids of the Borysthenēs river (possibly the country of Gerrhos mentioned by Herodotus), although some aristocratic burials were also located in the forest steppes. These burials, which included horse sacrifices, were continuations of the Ciscaucasian burial traditions. Scythian burials from this period include: