中部ジャワ・サンギランドーム付近の貝化石

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Paleoenvironmental analysis based on the Pliocene-Pleistocene molluscan assemblages collected from the Sangiran Dome area, Central Java, is given in connection with faunal transformation with time. The stratigraphy around the dome area is as follows in ascending order according to Indonesia-Japan Joint Research Team (1980); the Kalibeng Formation-disconformity-the Pucangan Formation-conformity-the Kabu Formation-disconformity-the Notopuro Formation and Terrace Deposits. Among these formations, the Pucangan has been known as the deposits which yielded pithecanthropine cranial endocast (Jacob & Kadar, 1981). Twenty-five species of marine bivalvia, 25 species of marine gastropoda, three species of nonmarine bivalvia and nine species of non-marine gastropoda are discriminated from four horizons of the Kalibeng Formation and 16 horizons of the Pucangan Formation. Paleoenvironmental conditions in which the Kalibeng and Pucangan formations were accumulated can be inferred based on change in the molluscan assemblages through late Cenozoic time. A warm, shallow marine condition during the deposition of the upper part of the Kalibeng gradually changed into tidal zone environments and subsequently to a limnic depositional condition. Fresh water environments prevailed during the deposition of the lower Pucangan. Then, a shallow marine environment spread once again over the area during the deposition of the lower part of the upper Pucangan. This sea retreated again, and brackish estuary environment was created. Finally, a fresh water condition possibly coastal lake and/or swamp returned to the area toward the upper part of the upper Pucangan.
日本古生物学会の論文
1983-06-15

中部ジャワ・サンギランドーム付近の貝化石

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