Doubtful Cyanobacteria in the Giant Oolitic Limestone of the Lower Triassic Feixianguan Formation from the Yudongzi Section of Jiangyou, Sichuan and Two Episodes of Early Triassic Cyanobacterial Explosions
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Abstract:
The disaster event of marine ecological environments at the end-Permian resulted in mass extinction of marine benthic fauna and the explosion of Early Triassic cyanobacteria mainly found from microbialite. The abundant doubtful cyanobacteria are first discovered in the giant oolitic limestone of the lower part of the Feixianguan Formation. Their types and structures are very different from cyanobacteria found in the microbialite at the bottom of the Feixianguan Formation reported before. The gathering of doubtful cyanobacteria in the giant ooids and host rocks implies that the formation of the giant oolitic limestone was closely related to the doubtful cyanobacterial activities. In this case it is similar to the formation of microbialite found at the bottom of the Feixianguan Formation. It can be inferred that two episodes of Early Triassic doubtful cyanobacterial explosions occurred in this region and provide a clue that there were two events of marine ecological environmental deteriorations at least. However, the Early Triassic explosions of cyanobacteria are of benefit to improvement of marine ecological environments and biotic recovery. Therefore, it is significant for the very late Early Triassic and the Middle Triassic overall biotic recovery and radiation.
