Biogenic sedimentary structures in outer Bengal Fan deposits drilled during Leg 116

Abstract

Bioturbation in the outer Bengal Fan is influenced by bottom-water oxygenation and turbidite deposition. Biogenic traces reflect changing bottom-water oxygenation over the last 17 m.y.; in the Miocene clear oxygenation cycles are developed in the hemipelagically deposited sections. Since the Pliocene these cycles are less pronounced and an intermediate level of oxygenation is documented by the trace fossils. -from Authors