Through Geological process in the form of tectonic plates‘ shifting, volcanic activities, and the changes of sea level in 2 millions years, Sangiran at least had experienced three environmental changes, from marine to swamp, and to be mainland as we see nowadays. The information of these changes are gained by observing the Sangiran’s stratigraphy, since every layer keeps the different information on each environment. (Harry Widianto dan Iwan Setiawan Bimas)
