Before drilling ended in 1994, the team hit a layer of 2.7 - billion - year - old rock, almost a billion years older than the Vishnu schist at the base of the Grand Canyon. (discovermagazine.com)
Top: Gandharan, Kneeling and Seated Mourners, circa 3rd to 4th century, Carved gray - green schist bas (low)- relief. (smartmuseum.uchicago.edu)
Among Catal Huyuk's treasures are schist plaques of the Goddess with consort and child» a sacred family. (firstthings.com)