 The Jiao-Liao-Ji Belt joined the two small blocks (the Longgang and Langrim blocks) together as the larger Eastern Block, whereas the Trans-North China Orogen shows the assembly of Eastern and Western Blocks, forming the North China Craton.The root of the craton was collapsed 130–120 million years ago (the Cretaceous Period), resulting in a thinner lithosphere.Although there has not been any evidence of Hadean rocks in the Eastern Block, a number of Hadean zircons were dated as >4 billion years ago.