Paläontologisches Institut und Museum ; Universität Zürich
Department of Mineralogy ; University of Geneva
Paléoenvironnement et paléobiosphère (PP) ; CNRS - INSU - Université Claude Bernard Lyon 1 (UCBL)
Department of Earth Science ; ETH
Guangxi Bureau of Geology and Mineral Resources ; Guangxi Bureau of Geology and Mineral Resources
Research supported by the Swiss NSF project 200021-103335 and by the Swiss NSF project 200020-113554.