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Premium Castle Grey is categorized as Jurassic volcanic rock from Karadag (Montenegro) over 150 million years ago. The Mediterranean fauna, including 2870 plants and 5350 animal species, was transformed into Castle Gray Rock after crustal movement caused a volcanic eruption. Anatolia was the earliest habitat in Neolithic. Castle Gray Rock was claimed as the premium marble and later was used to accomplish the building of Karaman Kalesi in Turkey in the 11th or 12th century by Byzantine Empire. The castle consists of three concentric ramparts. The innermost rampart takes the form of a keep-like citadel with nine bastions; four circular and five rectangular.