Characteristics of Foraminifera in the Pleistocene-Holocenesediments ofSoc Trang-Bac Lieu area

Abstract

Soc Trang-Bac Lieu area belongs to the Mekong River delta. It is alsoconsidered to be stronglyaffected by climate change and rising sea levels. The Holocenedeglaciatialaccelerated transgression, leading to a rapid formation of shallow marine and coastal sediments, which overly the pre-existing continentalsediments across the Mekong River delta. Foraminifera is the microfossil group, which iswidely found in marine sedimentand is commonly used to interpretthe depositional environment, stratigraphic and paleo-geography. This study presents new resultsof this microfossil group in the Pleistocene-Holocene derived from 20 sediment samples from two drill holesin the Soc Trang-Bac Lieu area.Based on their composition and morphology, we identifieda total of 33 species, belonging to 18 genras, 11 families and 4 suborders Foraminiferanamely Rotaliina Delage et Hérouard, 1896; Miliolina Delage et Hérouard, 1896; Textulariina Delage et Hérouard, 1896 andLagenina Delage et Hérouard, 1896.All of theobtained Foraminifera indicate that theirmorphologyand anatomical characteristics characterize estuarine and shallow marine environments, where theydemonstrate strong hydrodynamicregimesand wide variation of salinity and temperature