The oldest material culture artifacts found in the region date back to the Neolithic Age. On the other hand, Azerbaijani archaeologists have found that the history of Nakhchivan dates back to the Stone Age (Paleolithic). As a result of archaeological diggings, archaeologists discovered a great number of Stone-Age materials in different regions of Nakhchivan. These materials were useful to study the Paleolithic age in Azerbaijan. Pollen analysis conducted in Gazma Cave (Sharur District) suggests that humans in the Middle Palaeolithic (Mousterian) lived not only in the mountain forests but also in the dry woodlands found in Nakhchivan. Several archeological sites from the dating from the Neolithic have also been found in Nakhchivan, including the ancient town of Ovchular Tepesi, which also includes some of the oldest salt mines in the world.