The oldest stratigraphic of Sangiran is the blue clay of Kalibeng Formation. It is seen from the central part of Sangiran Dome which is Puren River, the branch of Cemoro River. The thick- shell of marine mollusk was abundantly sedimented in this layer, represented the marine environment. (Suwita Nugraha, Wulandari, Iwan SB)
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 The oldest stratigraphic of Sangiran){kind=link}