Linking western North China Craton with the East Gondwana in Late Ordovician.
The Middle Ordovician detritus derived from the basement of NCC.
The Upper Ordovician sediments sourced from the eastern Gondwana.
A prominent tectonic shift on the western margin of the NCC at ca. 458 Ma
A foreland basin between the western NCC and eastern Gondwana at ca. 458 Ma.