Mesoproterozoic thinly bedded siliceous shallow-marine shales
From: Changcheng System, Tianjin, China
Size: 20 cm
Dolomite from a Mesoproterozoic Carbonate Platform in North-China
From: Jixianian System, Tianjin, China
Size: 33 cm
Proterozoic shallow seas over China were the site of formation of the largest known Magnesite deposit in the world.
Magnesite, Dashiqiao Magnesite Deposit, Liaoning, China.
Size: 20 cm