A high-resolution record of the late Hirnantian to Aeronian marine redox change in South China and its relationship with the record of graptolite biodiversity

Zongyuan Sun, Fangqi Zhao, Michael J. Melchin, Junxuan Fan, Bolin Zhang, Xin Jin, Zihu Zhang, Shengchao Yang, Qing Chen, Yiying Deng, Linna Zhang