Large amounts of glauconite, a green, iron- and potassium-rich mineral, were observed within marine sediment cores in the deep sea (>2000 m) in the North Atlantic Ocean. It is generally agreed that the presence of glauconite within sediment is linked to low sedimentation rates and slightly stronger bottom currents in the ocean. We will be using age dating techniques to determine the absolute age of the glauconite minerals to compare with the age of the surrounding sediment. We will also be comparing the shapes, chemical characteristics, and age of the glauconite with the characteristics and age of celadonite, a green mineral with the same chemical formula as glauconite that formed within the underlying basalt sequence. The findings from this ongoing study will provide further context about the seawater circulation between oceanic crust and the overlying sediment, and inform ocean crust dynamics during specific time periods.