Mount Pilyaki is an extinct volcano of the Middle Jurassic period. It occupies an area of 4 square kilometers and is second only to
Kara-Dag in Crimea, significantly surpassing the latter in height, reaching 1055 meters above sea level.
Volcanic tuffs and spilite breccias are common in this mountain range, the weathering of which has formed bizarre formations in many places. The top of the mountain is composed of thick layers of volcanic tuff. It connects with the Ai-Petri Yayla.
Separate outcrops of Pilyakov volcanic rocks, reaching a thickness of 350 meters, clearly demonstrate the geological history of the mountainous Crimea.