Candidate section for the base of Cambrian Stage 10 at Wa'ergang, Hunan, China.

A well exposed section through the lower Shenjiawan Formation (uppermost Cambrian-lowermost Ordovician) has been proposed as a candidate stratotype for the GSSP of provisional Stage 10 (Cambrian: Furongian Series). The section contains remains of the agnostoid trilobite Lotagnostus americanus, which is the guide fossil that marks the provisional base of the stage. This section is notable because it is one of few known that also yields the conodont Eoconodontus notchpeakensis. Trilobite biostratigraphy has been documented through the entire Shenjiawan Formation in the Wa’ergang section. The lower 32 m of the Shenjiawan Formation has been especially well studied, leading to the recognition of three agnostoid zones and identifying the first appearance of L. americanus at 29.65 m above the base of the formation. Most of the Shenjiawan Formation has been intensively sampled for conodonts, leading to recognition of four conodont zones. E. notchpeakensis has been identified at eight sample horizons, with the lowest occurrence being 145 m above the base of the formation, or roughly halfway through the projected thickness of Stage 10. Dense sampling for carbon isotopes (δ18C) reveals a curve showing a negative excursion having a peak of -1.0‰ close to the FAD of L. americanus.