In 2010-2016, new Chalcolithic Age monuments were reported from the Nakhchivançay and Sirabçay valleys. Together with Nakhchivan Tepe, these can be used to specify a period of Chalcolithic Age monuments of the South Caucasus. The ceramic complex of Nakhchivan Tepe is very similar to that of Dalma Tepe. The type of painted ceramics of the Dalma Tepe are known from the settlements of Uzun Oba and Uçan Ağıl. Impressed ceramics have been attested at Uçan Ağıl by a single copy, but have not been found in other settlements. Similar ceramics have also been found in isolated copies in monuments in Karabakh. Monuments in the Lake Urmia basin generally use Syunik obsidian. The settlements of Nakhchivan generally used Gekche obsidian from the lake basin in present-day Sevan. Even though Syunik is closer to Nakhchivan than to Gekce, in Nakhchivan, Syunik obsidian is not common. Apparently, the tribe occupying the Lake Urmia basin had connections to the obsidian deposits of the Zangezur Mountains by means of the tribes of Nakhchivan. The recent recovery of a stone hammer in the Nakhchivançay valley with remains of copper on it demonstrates that the connections between these tribes and the Zangezur Mountains were not only for deposits of obsidian, but also for copper deposits.