MARGIN: 0cm 0cm 0pt" class=MsoNormal>Clay minerals have such main types as illite, chlorite, smectite and kaolinite. They could record rich information of climatic and environmental changes during their formation and hence are good proxies in climatic and environmental study. Many factors such as tectonic movement, climate, basin size, surface parent rocks, soils, vegetative cover, landscape, water media properties, wind and diagenesis, affect the clay mineral formation. The types and quantity of clay minerals in strata depend on these factors in varying degrees. Tectonic movement and climate are two primary factors which dominate the types and quantity and control other secondary factors which influence clay mineral formation. It is very difficult and unsuitable to analyze climatic and environmental changes during the tectonic movement phase only by clay minerals. For a long geological time which has tectonic movement, sedimentary facies and palaeogeography must be used to decipher paleogeography and plaeo-environment information.ml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />