This dataset contains size separate coccolith stable isotope results (oxygen and carbon), size separated coccolith area differences and images/analysis for size separated coccolith smear slides for samples from IODP Expedition 363, Site U1482, spanning from the recent to the late Miocene. Site U1482 is located on the northwest Australian margin, on the Scott Plateau, at 15°3.32ʹS, 120°26.10ʹE in 1466 m water depth