The variation curves of the organic carbon isotope values in the Dahe Composite Section and the chemostratigraphic correlation among some classical sections (IMAGE)
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In the Dahe Composite Section, the significant positive δ13Corg shifts occur in the upper part of the Yulungssu Formation and the lower part of the Xishancun Formation, and the δ13Corg value reach the peak (-20.0‰) in the sample YD-25 from the lowermost of the Xishancun Formation, which replicate the δ13Corg variation trend from the uppermost Silurian to the lowermost Devonian worldwide. The SDB in the Dahe Area is better to be placed between the samples of YD-17 and YD-18 from the lowermost part of the Xishancun Formation, based on the correlation of δ13Corg variations between the Dahe Composite Section and the Klonk-1 Section close to GSSP in the Prague Basin, Czech Republic together with four sections from Turkey, Morocco, and China.
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