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