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Under sen Trias inträffade flera globala miljöförändrigar, inclusive klimatinstabilitet, och den mest markanta var det biotiska utdöendet vid Norian-Rhaetian-gränsen (NRB). Stora karbonatplattformar etablerades längs tethyshavet och exporterade periodvis karbonat-sediment till det angränsade havsbottnet, särskilt på bathyalt djup. Petrografisk analys av elva prover från sex density flow-avlagringaDuring the late Triassic period several global environmental changes took place, including climate instability, and the most distinctive one was the biotic extinction at the Norian – Rhaetian boundary (NRB). Large carbonate platforms were established along the Tethys ocean and periodically exported carbonate sediments to the adjacent ocean floor, and especially at the bathyal depth. Petrographic
