The coal measure facies can be divided into five ones such as dry peat marsh, moist forest peat marsh, transitional margin marsh, living water peat marsh and open water facies.

The Miaohe-type biotas occur in the black shale and siliceous shale in the transitional areas from the late open platform facies to deep-water shelf-bathyal facies.

The transgressions of Middle Pleistocene and the early Late Pleistocene were weak and represented by deposits of the transitional nature from Marine to continental facies...