《Table 1 Global and Chinese correlation chart of Devonian chronostratigraphic unitsa)》

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《Devonian integrative stratigraphy and timescale of China》

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a) Modified after unpublished report of Hou et al.（2011），the stratigraphic chart of China（2014）and the Geological Time Scale 2016.A=Ammonite，B=Brachiopod，C=Conodont，Cor=Coral，G=Graptolite，T=Tentaculite，F=Foraminifer，Fi=Fish，V=Vetebrate.

The term‘Devonian’was first proposed by Sedgwick and Murchison（1839），to define the marine rocks in Devon，southwest England，which were considered to be the equivalents of terrestrial Old Red Sandstone deposits in Wales.In 1985，the global Devonian chronostratigraphy scale was formally defined and subdivided into three series，the lower，middle and upper，and contains seven global stages（Ziegler and Klapper，1985）.The lower Devonian comprises the Lochkovian，Pragian and Emsian stages in ascending order，the middle Devonian consists of the Eifelian and Givetian，and the upper Devonian comprises the Frasian and the ensuing Famennian（Table 1）.Ratified by IUGS in1972，the basal Devonian GSSP is the first‘golden spike’established by the International Commission on Stratigraphy（Chlupác and Kukal，1977）.Till 1996，all seven Devonian stages’GSSPs have been formally defined and ratified（Yolkin et al.，1997）.It should be noted though，that the acceptance of the GSSPs for the bases of the Emsian and the Devonian-Carboniferous boundary（DCB）have received major criticism since the very beginning of their ratification，and in 2008，the Subcommission on Devonian Stratigraphy（SDS）and Subcommisson on Carboniferous Stratigraphy（SCCS）have decided to redefine the boundary criteria and levels（Becker，2009；Aretz，2010），which are still ongoing investigations（Slavík and Brett，2016；Spalletta et al.，2017；Table 1）.