Oxygen and carbon isotopic data for 13 planktonic foraminifers from the Miocene of DSDP Site 289 strongly support the idea that the species have a preferred depth habitat and that their depth relationships remained largely unchanged during the Miocene. However, the relative depth rankings of Globorotalia (Menardella) menardii and Globorotalia (Menardella) limbata changed from deep to intermediate and from deep to shallow, respectively, during the late Miocene between ~9.9 and 7.5 Ma.

Sediment depth is given in mbsf. All foraminifera were picked from the >250 µm size fraction.

Supplement to: Gasperi, Joseph T; Kennett, James P (1993): Miocene planktonic foraminifers at DSDP Site 289: depth stratification using isotopic differences. In: Berger, WH; Kroenke, LW; Mayer, LA; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 130, 323-332