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Late Hauterivian dinoflagellates from the lower part of the Chengzihe Formation in the Jixi Basin, eastern Heilongjiang, northeastern China


Late Hauterivian dinoflagellates from the lower part of the Chengzihe Formation in the Jixi Basin, eastern Heilongjiang, northeastern China



Acta Palaeontologica Sinica 39(1): 46-62



ISSN/ISBN: 0001-6616

The Chengzihe Formation is widely distributed in the eastern Heilongjiang Province. A total of 22 dinoflagellate cyst taxa are recorded, of which 19 species from 15 genera are described and illustrated, including one new species and one new combination. They are subdivided into two assemblages: 1) the Dontochitina operculata-Muderongia tetracantha assemblage in the lower part; and 2) the Vesperopsis zhaodongensis assemblage in the upper part. Based on the characteristics of the dinoflagellate assemblages and the global stratigraphic ranges of many significant dinocyst species, two assemblages are considered to be Late Hauterivian in age. The age of the lower part of the Chengzihe Formation is possibly Late Valanginian-Late Hauterivian.

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Accession: 019294539

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