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    New chronostratigraphic constraints on the Yixian Formation with implications for the Jehol Biota

    Access Status
    Fulltext not available
    Authors
    Chang, S.
    Gao, K.
    Zhou, C.
    Jourdan, Fred
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Chang, S. and Gao, K. and Zhou, C. and Jourdan, F. 2017. New chronostratigraphic constraints on the Yixian Formation with implications for the Jehol Biota. Palaeogeography, Palaeoclimatology, Palaeoecology. 487: pp. 399-406.
    Source Title
    Palaeogeography, Palaeoclimatology, Palaeoecology
    DOI
    10.1016/j.palaeo.2017.09.026
    ISSN
    0031-0182
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/57931
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier B.V. The fossils of the Cretaceous Jehol Biota exhibit excellent preservation and extraordinary diversity. Terrestrial fossils, including plants, insects, dinosaurs, birds, mammals and freshwater invertebrates have been discovered from the Dabeigou, Yixian and Jiufotang Formations (and correlative strata) in Central and East Asia. Significant specimens have been recovered from the Yixian Formation of Inner Mongolia, Hebei Province, western Liaoning Province of NE China. The Yixian Formation is generally divided (from bottom to top) into the Lujiatun Unit, Lower Lava Unit, Jianshangou Unit, Upper Lava Unit, Dawangzhangzi Unit and Jingangshan Unit. However, previously reported age data obtained through a range of methods and applied to different units of the Yixian Formation do not consistently integrate with the Yixian's commonly accepted stratigraphic interpretation. Here we summarize previous age data for the Yixian Formation and recalibrate previously reported 40 Ar/ 39 Ar ages by using new age interpretations for the same standard (i.e. FCs = 28.294). We also present new high-precision 40 Ar/ 39 Ar ages of 125.8 ± 1.0 Ma and 126.0 ± 0.8 Ma for two basaltic samples from the Lujiatun Unit, a unit of previously uncertain age. The new age data and re-calibrated published data indicate that the Lujiatun Unit was deposited contemporaneously with the Jianshangou Unit. The widely accepted stratigraphic column for the Yixian Formation therefore requires reinterpretation. Our study provides significant clues for reconstructing sedimentary environment for the fossil-rich Yixian deposits and allows to constrain evolutionary rates for early mammals, primitive birds and feathered dinosaurs.

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