Wang, Nie-Wen, 1981, Discovery of Evolutononion shanxiense gen. et sp. nov. and its stratigraphical and paleogeographical significance, Acta Geologica Sinica 55(1):14-19.

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Publication

The well-preserved foraminiferal specimens, named here as Evolutononion shanxiense gen. et sp. nov., were isolated from two core samples collected from the Late Quaternary deposits at the depth of 77m. to 83m. in the Yuncheng Basin, Shanxi province. About a thousand of foraminiferal specimens were obtained but they are composed of only one species, associated with numerous ostracods such as Ilyocypris, Candona, Candoniella, Cyprideis, Limnocythere, Eucypris, small bivalves such as Corbicula and some otoliths. Evolutononion differs from Nonion by its semievolute adult stage of test and is similar to the latter in the early stage of development. The present discovery suggests the presence of a Late Quaternary transgression in the Yuncheng Basin and adjacent areas.

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