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Stratigraphic distribution of asterorotalia and pseudorotalia foraminifera in the cenozoic of east china and its geologic significance

Stratigraphic distribution of asterorotalia and pseudorotalia foraminifera in the cenozoic of east china and its geologic significance

Acta Micropalaeontologica Sinica 6(1): 65-74

Asterorotalia and Pseudorotalia are typical warm-water benthic foraminifera, with three species having been found to live in the tropical and subtropical shallow seas of China. Among them, Asterorotalia pulchella and Pseudorotalia schroeteriana are confined to the South China Sea and the southern part of the East China Sea. Pseudorotalia indopacifica has a more extensive distribution, spreading northwards to the southern margin of the Yellow Sea. Their distribution is controlled by warm currents. Since both genera have been found widespread in the Cenozoic of East China, they can be used as indicators in recognizing the paleoenvironment and biostratigraphy. In the Late Neogene these two genera were represented by Asterorotalis subtrispinosa, Pseudorotalia indopacifica, P. schroeteriana, P. tikutoensis and P. yabei which could be found only from Taiwan and the northern shelf of the South China Sea. The last two species seem to disappear in the Quaternary of the South China Sea areas, whereas the first three species have remarkably extended northwards to the Bohai Sea in the Late Pleistocene, suggesting that the water temperature of the Yellow Sea and the Bohai Sea might be 5.degree. -6.degree. C higher than that at present. Their reduction or absence in the Holocene was probably due to the formation of the cold-water mass in the Yellow Sea; Psuedorotalia was confirmed to the areas south of the Haizhou Bay (35.degree. N) and Asterorotalia to the areas south of the Hangzhou Bay (31.degree.N).

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Stratigraphic distribution of Asterorotalia and Pseudorotalia (foraminifera) in the Cenozoic of Eastern China and its geologic significance. Acta Micropalaeontologica Sinica = Weiti Gushengwu Xuebao 6(1): 65-74, 1989

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