Xu hướng phục hồi động vật hai mảnh vỏ Trias biển ở miền Bắc Việt Nam

Abstract

This study aims to synthesize stratigraphic and fossil data to analyze the recovery of Triassic marine bivalves in northern Vietnam. The stratigraphic units containing characteristic bivalve assemblages, functional morphology, and taxonomic framework were analyzed, showing the recovery of bivalves through three stages of the Triassic according to two main parterns: taxonomic recovery and ecological recovery. These patterns are comparable with South China; however, the diversity level in northern Vietnam is lower due to the limited extent of marine basins, and the most pronounced recovery was delayed until the Middle Triassic. From the Carnian onward, continentalization restricted the development of fossil group.