Abstract: 4D geologic space is composed of 3D space and time scale, by which the recorded geologic process is basis for geologic space recovery. In terms of concept of 4D geology, the geologic process could be described as the time chain. The geologic significance at a time can be explained by time scale slice up according to 3D geologic model. 4D geologic model has been widely applied to analyses of palaeostructure, palaeogeomorphology and depositional stting.

Key words: 4D geology, time scale, geologic modeling, palaeostructure, palaeogeomorphology, sedimentary setting