Globular Amphora culture
The Globular Amphora culture stretched from the middle Dnieper to the Elbe during the late 4th and early 3rd millennia BC. It has been suggested as the locus of a Germano-Balto-Slavic continuum (the Germanic substrate hypothesis), but the identification of its bearers as Indo-Europeans is uncertain. The area of the culture contains a number of tumuli, which are typical of Indo-Europeans.