GSSP for Jiangshanian Stage
Definition:
The GSSP is located at the Jiangshan City, western Zhejiang Province, China. The GSSP is exposed in a natural outcrop near Duibian Village. It is defined at the base of a limestone (wackestone) layer 108.12 m above the base of the Huayansi Formation in the Duibian B section, coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis (base of the A. orientalis Zone). The GSSP is at a position of 28° 48.977´N latitude and 118º 36.887´E longitude.
Location:
At the Duibian B section, Zhejiang Province, South China.
In the Duibian B section, the upper part of the Huayansi Formation consists mainly of a succession of dark, thin-bedded limestones (wackestones) with thin shale interbeds; light-colored ribbon limestones (wackstones or packstones) are present in places.
Primary Markers:
FAD of the cosmopolitan polymerid trilobite Irvingella angustilimbata.
Secondary Markers:
Radiometric Dating:
Stable Carbon Isotopes:The GSSP coincides near the end of a large positive carbon isotopic excursion (SPICE excursion).
Correlation Events:
FAD of agnostid trilobite Agnostotes orientalis and the FO of polymerid trilobite Irvingella angustilimbata