 Common materials included rammed earth, compressed earth blocks, brick, stone, and any combination of these.The walls of fortifications and cities during the era of the Song Dynasty and Jin Dynasty were built with a variety of different materials including rammed earth, stone, and bricks.The Song Dynasty were known for building walls with a rammed earth core and layered with stones and bricks, which were able to resist attacks from all but the most powerful Mongol siege weaponry.