🇷🇺 Russia · Kurgan
Sukhaya Termista — Catacomb Culture Kurgan Field
Late Yamnaya → Catacomb → Srubnaya · Yamnaya → Catacomb Grave culture → Srubnaya (Timber Grave)
Kalmyk steppe Catacomb Grave kurgans (2800–2200 BCE) with shaft-and-niche chambers cut into Yamnaya mounds — post-Yamnaya chariot horizon and ‘caterpillar’ pottery.